#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

int main(void) {
  ll a, b, c;
  cin >> a >> b >> c;
  cout << (((a + c - 1) / c) * 3 <= ((a + b - 1) / b) * 2 ? "YES" : "NO") << endl;

  return 0;
}