#include <bits/stdc++.h>
using namespace std;
const double eps = 1e-9;
int main() {
  int n, R, r;
  cin >> n >> R >> r;
  if (n == 1) {
    cout << (R >= r ? "YES" : "NO");
    return 0;
  }
  if (n == 2) {
    cout << (R >= 2 * r ? "YES" : "NO");
    return 0;
  }
  R -= r;
  if (R <= 0) {
    cout << "NO";
    return 0;
  }
  double angle = M_PI / n;
  if (sin(angle) * R + eps >= r)
    cout << "YES";
  else
    cout << "NO";
  return 0;
}
