#include <bits/stdc++.h>
using namespace std;
int n, R, r;
bool can() {
  if (n == 1) return r <= R;
  if (r * 2 > R) return false;
  return sin(M_PI / n) + 1e-9 >= (double)r / (R - r);
}
int main() {
  scanf("%d%d%d", &n, &R, &r);
  if (can()) {
    printf("YES");
  } else {
    printf("NO");
  }
  return 0;
}
