#include <bits/stdc++.h>
using namespace std;

int main() {
  double a, b, c;
  cin >> a >> b >> c;
  double x = ceil(a / b);
  double y = ceil(a / c);
  bool flag = false;
  if (y / x <= 2.0 / 3.0) flag = true;
  cout << (flag ? "YES" : "NO") << endl;
  return 0;
}