What follows is an opinion from a United States Court of Appeals.
Intervenors who participated as parties at the courts of appeals should be counted as either appellants or respondents when it can be determined whose position they supported. For example, if there were two plaintiffs who lost in district court, appealed, and were joined by four intervenors who also asked the court of appeals to reverse the district court, the number of appellants should be coded as six.
Your task is to determine or not there was any amicus participation before the court of appeals.

Opinion:
Donald BAXTER, Appellant, v. UNITED STATES of America, Appellee.
No. 18211.
United States Court of Appeals District of Columbia Circuit.
Argued July 7, 1964.
Decided July 23, 1964.
Petition for Rehearing en Banc Denied Nov. 9, 1964.
Mr. Robert W. MeChesney, Jr. (appointed by this court), Washington, D. C., for appellant.
Mr. Anthony A. Lapham, Asst. U. S. Atty., with whom Messrs. David C. Acheson, U. S. Atty., and Frank Q. Nebeker and Victor W. Caputy, Asst. U. S. Attys., were on the brief, for appellee.
Before Fahy, Weight and McGowan, Circuit Judges.
PER CURIAM.
The appeal is from a judgment of conviction of robbery, in violation of D.C. Code § 22-2901, and is rested upon the admission of evidence now claimed to have been inadmissible. In view of all the circumstances of the case we think it is not one for the exercise of our discretion permitted by Rule 52(b), Fed.R. Crim.P.
Affirmed.

Question: Was there any amicus participation before the court of appeals?

Choices:
no amicus participation on either side
1 separate amicus brief was filed
2 separate amicus briefs were filed
3 separate amicus briefs were filed
4 separate amicus briefs were filed
5 separate amicus briefs were filed
6 separate amicus briefs were filed
7 separate amicus briefs were filed
8 or more separate amicus briefs were filed
not ascertained

Answer: 0