#include <bits/stdc++.h>
using namespace std;
double abs(double a, double b) {
  if (a < b)
    return b - a;
  else
    return a - b;
}
int main() {
  int n;
  double R, r, ans, f;
  scanf("%d%lf%lf", &n, &R, &r);
  f = R - r;
  if (n == 1) {
    if (R > r || abs(R, r) <= 1e-10) {
      printf("YES\n");
    } else {
      printf("NO\n");
    }
    return 0;
  }
  ans = r / sin((3.14159265357) / n);
  if (ans < f || abs(ans - f) < 1e-10) {
    printf("YES\n");
  } else
    printf("NO\n");
  return 0;
}
