#include <bits/stdc++.h>
using namespace std;
int main() {
  double n, R, r;
  cin >> n >> R >> r;
  if (n == 1) {
    if (R >= r)
      cout << "YES";
    else
      cout << "NO";
    return 0;
  }
  if (2 * r > R) {
    if (n == 1)
      cout << "YES";
    else
      cout << "NO";
    return 0;
  }
  double c = (R - r) * sin(3.1415926 / n) + 0.000001;
  bool a = (c >= r);
  if (a)
    cout << "YES";
  else
    cout << "NO";
  return 0;
}
