#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, R, r;
  cin >> n >> R >> r;
  if (n == 1) {
    puts(r <= R ? "YES" : "NO");
    return 0;
  }
  double x = r * sqrt(2. / (1. - cos(2 * acos(-1.) / n)));
  x += r;
  if (x - 1e-12 < R)
    puts("YES");
  else
    puts("NO");
  return 0;
}
