var n, m : longint; function findans(n, m : longint) : longint; begin if n = 0 then exit(m); if m = 0 then exit(n mod 3); exit(findans(n - 1, m) - findans(n, m - 1) + findans(n - 1, m - 1)); end; begin read(n, m); writeln(findans(n, m)); end.
输入：5 6
输出：1
