#include <bits/stdc++.h>
using namespace std;
int main() {
  double R, r, n;
  cin >> n >> R >> r;
  cout << (r > R or n > 1 and (R - r) * sin(M_PI / n) + 1e-8 < r ? "NO"
                                                                 : "YES");
  return 0;
}
