Defendants-Appellants Oscar Fabio Moreno (“Oscar”) and Hernán Moreno (“Hernán”) (collectively, the “Morenos”) appeal from judgments of the United States District Court for the Southern District of New York (Sonia Sotomayor, Judge) convicting them, following a jury trial, of conspiring to violate the narcotics laws, in violation of 21 U.S.C. § 846, maintaining a place for the purpose of manufacturing, distributing, or using narcotics, in violation of 21 U.S.C. § 856, and conspiring to tamper with a witness, in violation of 18 U.S.C. § 371, and sentencing them both to life imprisonment. On appeal, the Morenos contend,
inter alia,
that (1) the evidence was insufficient to convict them; (2) a new trial is required because of alleged perjury committed by several government witnesses; and, (3) the District Court erred in its determination of the amount of crack cocaine (also known as “cocaine base” or “crack”) involved in the offense. Following our decision in
United States v. Barnes,
*210 BACKGROUND
On appeal of a judgment of conviction where a defendant raises a claim of insufficient evidence, we view the evidence in the light most favorable tо the government.
See United States v. Morrison,
In 1992, Pimentel both worked for a dealer named “Fon” and began to sell drugs on his own, purchasing his drugs frоm Hernán and Oscar at Oscar’s apartment at 1055 Walton Avenue For example, Pimentel testified that on one occasion he went to 1055 Walton Avenue and watched Oscar weigh out fourteen grams of cocaine; on two other occasions, the first of which was in July or August 1992, Pimentel made two one-kilogram purchases of cocaine. Another witness at trial, Pedro Silva Maldonado (“Silva”), who also worked for Fon, testified that he and Pimentel purchased drugs from Hernán and Oscar on several occasions. In November 1992, Silva was present when Oscar gave Pimen-tel a shopping bag full of cocaine inside 1055 Walton. Silva and Pimentel made an $11,000 purchase of cocaine from the Morenos at Oscar’s apartment at 1055 Walton in December 1992. Silva and another cooperating witness who testified at trial, Pablo Reyes (“Reyes”), were arrested in a raid on Fon’s drug apartment at 1062 Walton Avenue on December 17, 1992. Pimentel escaped by jumping out a window; Hernán, who was also present, left before the police arrived.
The government also introduced testimony concerning the “controlled delivery” of a package that had been intercepted by the United States Customs Service and was discovered to contain cocaine. The package was addressed to Olga Moreno (“Olga”), Hernan’s and Oscar’s sister, at the apartment she shared with Oscar— Apartment 6C, 1055 Walton Avenue. The Customs Service delivered a dummy package to the apartment, and Olga’s boyfriend, Hector Becerra, was arrested when he left the aрartment with the package shortly after the delivery. Olga and Oscar were also arrested, and the apartment was searched by agents of the Customs Service, revealing, inter alia, a black electronic scale, two air pistols, cash, stereo equipment, baking soda, a balance scale, and gloves. 1
*211 The government’s witnesses also testified concerning threats made by the defendants to potential cooperating witnesses. In particular, Pimentel’s common-law wife, Milagros Taveras, testified about sеveral visits Hernán Moreno, his wife Marina Nunez, and Oscar Moreno made, both prior to the first trial of Olga and Oscar and prior to Oscar’s retrial, in which Hernán and Oscar made various threats concerning the ' possibility that Pimentel would testify against Oscar.
After a jury trial held from May 19, 1997 until May 30, 1997, both Oscar and Hernán were found guilty of each of the three counts in the third superseding indictment. On April 9, 1998, the District Court conducted a
Fatico
hearing to determine the amount of crack cocaine involved in the offense.
See United States v. Fatico,
On May 26, 1998, the District Court sentenced the defendants principally to life imprisonment. Both defendants received upward adjustments for obstruction of justice for witness tampering pursuant to Sentencing Guideline § 3C1.1 and for leadership roles (four lеvels for Hernán, three for Oscar) pursuant to § 3B1.1. Oscar also received a two-level upward adjustment for possession of a firearm in connection with the offense pursuant to Guideline § 2D1.1(b)(1).
This timely appeal followed.
DISCUSSION
1. Sufficiency of the Evidence
The Morenos assert that the evidence at trial was not sufficient to sustain their convictions.
2
A defendant “carries a heavy burden” when challenging the sufficiency of the evidence on appeal.
Morrison,
must consider the evidence in the light most favorable to the government, crediting every inference that the jury might have drawn in favor of the government, and we may overturn the conviction only if no rational trier of fact could have found the essential elements of the crime beyond a reasonable doubt. We defer to the jury’s determination of the weight of the evidence and the credibility of the witnesses, and to the jury’s choice of the competing inferences that can be drawn from the evidence.
Id. (internal quotation marks and citations omitted).
*212 In essence, the Morenos - claim that the testimony of the four cooperating witnesses at trial was contradictory, that none of these witnesses had any direct experience with the Morenos’ operation because they did not work for it, and that their testimony regarding rival drug dealers sharing space and working together was incredible. However, it was plainly for the jury to assess the credibility of the witnesses and to decide whether their testimony was believable. The evidence was more than sufficient for the jury to find that Hernán and Oscar engaged in a conspiracy with many others to sell powder cocaine and crack. Pimentel testified, for exаmple, that he observed Hernán actively involved in the sale of drugs in and around Walton and 165th Street from 1989 to 1992, and that Oscar took drugs from Apartment 6C at 1055 Walton and collected money from the sellers. Similarly, the evidence of Hernan’s presence at the 1055 Walton apartment, Oscar’s constant trips back and forth from 1055 Walton to replenish the dealers’ supplies, Pimentel’s and Silva’s purchases of cocaine from Her-nán and Oscar for Fon at 1055 Walton, and the drug paraphernalia seized in Apartment 6G supports the conviction for maintaining a place for distributing drugs. Finally, there was ample evidence of threats to a witness to support the convictions for conspiracy to commit witness tampering.
Accordingly, the Morenos’ insufficient evidence claim fails.
II. Alleged Perjury By Government Witnesses
Both defendants argue that they are entitled to a new trial because two government witnesses, Simon Enoa and Reyes, committed perjury. Pursuant to Rule 33 of the Federal Rules of Criminal Procedure, a district court “on motion of a defendant may grant a new trial to that defendant if required in the interest* of justice.” Fed.R.Crim.P. 33. The motion must be made “within 7 days after verdict ... or within such further time as the court may fix during the 7-day period,” or, in the case of newly discovered evidence, within two years after final judgment. Id.
In this case, the defendants failed to make a new trial motion before the District Court within seven days. Instead, counsel for Hernán Moreno suggested that he would make such a motion at a sentencing hearing on December 16, 1997 — six months after the guilty verdicts — in response to the District Court’s refusal to credit Enoa’s testimоny for sentencing. The District Court rejected this suggested motion and stated that such a motion would amount to “wasting your client’s time” because even without Enoa’s testimony the evidence against the defendants was “overwhelming.” The District Court also stated that Enoa “was one among many informants who took the stand in this case.... There [was] certainly nothing intentional about the government’s use of a confidential informant who comes forth with the type of information this one did.”
Because this purported motion for a new trial was made far outside the seven-day time limit, and there is no suggestion that the motion is based on newly discovered evidence, it was untimely, and we lack jurisdiction to consider the defendants’ argument on appeal.
See, e.g., United States v. Bramlett,
Even if the Morenos’ claim were not barred, it lacks merit. “Whether the introduction of perjured testimony requires a new trial initially depends on the extent to which the prosecution was aware of the alleged perjury.”
United States v. Damblu,
In this case, when the potential perjury of Enoa was raised at the December 16, 1997 hearing, the District Court concluded that “[t]here [was] certainly nothing intentional about the government’s use of a confidential informant who comes forth with the type of information this one did” and that “[t]he evidence ... was overwhelming against [the defendants].” We agree on both counts. Similarly, we conclude that, even assuming that Reyes’ testimony was untruthful, the government neither knew nor should have known of his perjury and the perjured testimony had no effect on the jury’s verdict. Thus, the defendants are not entitled to a new trial based on the alleged perjury of Enoa and Reyes.
III. Sentencing Issues
The Morenos argue that the District Court erred in its determination that over 1.5 kilograms of crack cocaine was involved in the offense, resulting for Sentencing Guidelines purposes in a base offense level of thirty-eight.
See
U.S. Sentencing Guidelines Manual § 2Dl.l(c)(l). “The quantity of drugs attributable to a defendant at the time of sentencing is a quеstion of fact for the district court, subject to a clearly erroneous standard of review.”
United States v. Hazut,
In the present case, the District Court’s determination of the amount of crack cocaine involved in the Morenos” offense was not clearly erroneous. The District Court based its decision on Pimentel’s testimony at the Fatico hearing on April 9, 1998. *214 Pimentel observed workers for the More-nos selling 200 to 300 bags of crack cocаine over the course of four to five months in 1989 at 1020 Walton. Over the following five to six months, Hernan’s group sold 100 to 200 bags of crack per day in front of 1020 Walton. Thus, even assuming that the Morenos’ operation sold only 200 bags of crack per day, they would have sold 1.5 kilograms of crack within twenty-five days. Based on this testimony, the District Judge had ample basis to conclude that Oscar and Hernán were responsible for over 1.5 kilograms of crack. 3
We also reject Oscar’s argument that the District Court erred by enhancing his sentence, three levels for his role as a manager or supervisor pursuant to § 3Bl.l(b) of the Guidelines. Pimentel testified at the Fatico hearing and at trial that Oscar supervised the workers, made managerial decisions, delivered drugs and collected money, engaged in bartering transactions with customers, and was, “practically speaking, a partner” with Her-nán who negotiated transactions in Her-nan’s absence. The District Court found as much, and we perceive no error.
After this appeal was fully briefed, the defendants submitted a supplemental letter arguing that their sentences should be vacated and that they should be resen-tenced in accordance with our recent decision in
United States v. Barnes,
On appeal, Barnes challenged the use of crack cocaine to determine the mandatory .minimum under 21 U.S.C. § 841(b)(1), and argued that, because the jury reached a general verdict of guilty on a conspiracy to possess multiple controlled substances, the verdict only authorized the application of the lowest mandatory minimum among the drugs charged. In evaluating Barnes’s argument, “we assume[d] that the jury convicted the defendant of conspiring to possess at least one of those controlled substances as to which the evidence was sufficient.”
Id.
at 668. However, “[b]ecause the general verdict of guilty [did] not tell us whether the jury convicted the defendant [of conspiring to possess] each of [the controlled substances],” we assumed “that the conviction [was] for conspirаcy to possess the controlled substance that carries the most lenient statutorily prescribed sentence” pursuant to 21 U.S.C. § 841(b).
Id.; see also United States v. Orozco-Prada,
Like the defendant in Barnes, the More-nos argue that they should not have been sentenced based upon the crack prong of the conspiracy, which, given the District Court’s finding that over 1.5 kilograms of cocaine base were involved in the conspiracy, permits a maximum sentence of life imprisonment. See 21 U.S.C. § 841(b)(1)(A). Instead, they maintain that they should have been sentenced based on the conspiracy to distribute powder cocaine, which thеy argue permits a maximum sentence of forty years’ imprisonment since the government proved only that between 500 grams and 5 kilograms of powder cocaine was involved in their offense.
In response, the government argues that we need not remand for resen-tencing because the evidence at trial supports the conclusion that the quantity of both powder cocaine and crack cocaine distributed by the Morenos’ organization would subject them to a statutory maximum penalty of life imprisonment under 21 U.S.C. § 841(b)(1)(A) for either substance. 4 The District Court had based the Morenos’ sentence on its finding that their offense involved at least 1.5 kilograms of crack, which is more than sufficient to satisfy the 50 gram minimum to subject the defendants to the statutory range of ten years’ to life imprisonment under § 841(b)(l)(A)(iii). The government argues that the trial record supports the additional conclusion that the Morenos conspired to distribute at least 5 kilograms of powder cocaine, thereby subjecting them to the same statutory range of ten years’ to life under § '841 (b)(1)(A)(ii).
We need not resolve this dispute with respect to the amount of powder cocaine involved in the offense because we conclude that the District Court should make the determination of that amount in the first instance. The Guidelines require that “[w]hen any factor important to the sentencing determination is reasonably in dispute, the parties shall be given an adequate opportunity to present information to the court regarding that factor.” U.S. Sentencing Guidelines Manual § 6A1.3(a);
see Fatico,
Accordingly, we remand to the District Court for such a determination. We recognize that in
Barnes
and
Orozco-Prada,
we gave the government a choice between accepting a resentencing of the defendants utilizing a lower mandatory minimum and permissive maximum, and retrying the defendants and seeking a special verdict. However, in both of those cases, the applicability of a more lenient statutory penalty provision was apparently undisputed.
Cf. Bames,
CONCLUSION
We have reviewed all of the defendants’ arguments on appeal, and, except to the limited extent discussed above, we find them to be without merit. Accordingly, we affirm the defendants’ convictions, but vacate the judgments and remand to the District Court for further proceedings consistent with this opinion.
Notes
. This "controlled delivery” formed the basis of the original indictment in this case, filed March 24, 1994, which charged Olga and Oscar Moreno and Hector Becerra with conspiracy to distribute and import cocaine and possession with intent to distribute heroin. A first superseding indictment was then filed, adding heroin distribution as an object of the narcotics conspiracy, and on February 9, 1995, Becerra pleaded guilty to narcotics conspiracy.
Olga and Oscar Moreno were then charged in a second superseding indictment with conspiring to distribute heroin and cocaine (Count One), possession with intent to distribute heroin (Count Two), and maintaining a place for manufacturing and distributing narcotics — 1055 Walton Avenue, Apartment 6C (Count Three). Following a ten-day jury trial, Olga was convicted on Counts One and Three, and both Olga and Oscar were acquitted on Count Two. Judge Cederbaum, before whom the case was tried, declared a mistrial as to
*211
Counts One and Three with respect to Oscar. Olgas conviction was subsequently affirmed on appeal.
See United States v. Becerra,
Prior to Oscar's retrial on the second superseding indictment, Oscar and Hernán (along with Hernan's wife, Marina Nunez) were arrested, and the government filed a third superseding indictment, which is the indictment upon which the Morenos were tried and convicted and from which this appeal arises.
. Since Oscar joins in Hernan's arguments pursuant to Fed. R.App. P. 28(i), we assume that Oscar joins in Hernan's challenge to the sufficiеncy of the evidence.
. This is not a case like
United States v. Shonubi,
. The government also suggests that because the Indictment in this case chargеd the defendants with trafficking in a sufficient'quantity of either substance to give rise to a violation of 21 U.S.C. § 841(b)(1)(A),
Barnes
and
Orozco-Prada
are not applicable. We have previously stated that "quantity is not an element of the crimes proscribed by Section [ ] 841(a),”
United States v. Campuzano,
. The fact that the issue is raised for the first time on appeal does not prevent us from reaching it.
See Barnes,
