#include <bits/stdc++.h>
using namespace std;
double pi = 2 * acos(0.0);
int main() {
  int n, R, r;
  double p, rm;
  scanf("%d %d %d", &n, &R, &r);
  if (n == 1) {
    if (r <= R)
      puts("YES");
    else
      puts("NO");
    return 0;
  }
  p = pi / n;
  rm = (R * sin(p)) / (sin(p) + 1);
  if (rm > r - 1e-10)
    puts("YES");
  else
    puts("NO");
  return 0;
}
