#include <bits/stdc++.h>
using namespace std;
double a[1000010];
int main() {
  double n, R, r, d;
  cin >> n >> R >> r;
  d = R - r;
  if (n == 1) {
    if (R >= r)
      cout << "YES" << endl;
    else
      cout << "NO" << endl;
  } else {
    if (2 * d * sin(3.141592653589793238462643383279502884L / n) + .0000001 >=
        2 * r)
      cout << "YES" << endl;
    else
      cout << "NO" << endl;
  }
}
