#include <bits/stdc++.h>
int main() {
  int n = 0;
  int R = 0;
  int r = 0;
  scanf("%d%d%d", &n, &R, &r);
  puts((n > 1 ? (R - r) * sin(3.1415926 / n) + 1e-7 < r : r > R) ? "NO"
                                                                 : "YES");
}
