#include <bits/stdc++.h>
int main() {
  int n;
  float R, r, res;
  scanf("%d%f%f", &n, &R, &r);
  if (n == 1) {
    if (R >= r)
      printf("YES");
    else
      printf("NO");
  } else {
    res = (R - r) * sin(3.1415926 / n);
    if (r > res)
      printf("NO");
    else
      printf("YES");
  }
  return 0;
}
