/* -*- coding: utf-8 -*-
 *
 * 218.cc: No.218 経験値1.5倍 - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

/* typedef */

/* global variables */

/* subroutines */

/* main */

int main() {
  int a, b, c;
  cin >> a >> b >> c;

  int nb = (a + b - 1) / b;
  int nc = (a + c - 1) / c;

  cout << (3 * nc <= 2 * nb ? "YES" : "NO") << endl;
  return 0;
}