#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, R, r;
  cin >> n >> R >> r;
  bool ok;
  if (r > R) {
    ok = false;
  } else if (n == 1) {
    ok = (r <= R);
  } else if (n == 2) {
    ok = (2 * r <= R);
  } else {
    double alpha = 2 * acos(-1.0) / n;
    double d2 = 2 * (R - r) * (R - r) * (1 - cos(alpha));
    ok = true;
    if (4 * r * r > d2 + 1e-8) ok = false;
    if (2 * r > R) ok = false;
  }
  if (ok)
    cout << "YES\n";
  else
    cout << "NO\n";
  return 0;
}
