#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, R, r;
  cin >> n >> R >> r;
  if (r > R || (n > 1 && (R - r) * sin(acos(-1) / n) < r - 1e-8))
    printf("NO\n");
  else
    printf("YES\n");
  return 0;
}
