#include <bits/stdc++.h>
using namespace std;
const double eps = 0.00000001;
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int r, R, n;
  cin >> n >> R >> r;
  double a = 1.0 * (R - r) * sin(3.14159265358979323846 / n);
  if (n == 1) {
    if (R >= r)
      cout << "YES";
    else
      cout << "NO";
    return 0;
  }
  if (a + eps > r)
    cout << "YES";
  else
    cout << "NO";
}
