#include <bits/stdc++.h>
using namespace std;
int main() {
  int a, b, c;
  cin >> a >> b >> c;
  int aux;
  aux = (b - c) * sin(M_PI / a) + 1e-8;
  if (a == 1 && b >= c || aux >= c) {
    cout << "YES\n";
  } else {
    cout << "NO\n";
  }
  return 0;
}
