#include <bits/stdc++.h>
using namespace std;
int a[100000];
int main() {
  int n, R, r;
  scanf("%d%d%d", &n, &R, &r);
  double a = 3.141592654 / n, x, s;
  s = sin(a);
  x = s * R / (1 + s);
  if (n == 1) {
    if (r <= R)
      cout << "YES";
    else
      cout << "NO";
  } else {
    if ((double)r <= x)
      cout << "YES";
    else
      cout << "NO";
  }
  return 0;
}
