#include<stdio.h>
#include <vector>
#include <list>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <algorithm>
#include <sstream>
#include <iostream>
#include <string>
#include <stdio.h>

using namespace std;

int main() {

	int a, b, c;
	cin >> a >> b >> c;

	if ((a+b-1)/b * 2 >=(a+c-1)/c * 3) cout << "YES" << endl;
	else cout << "NO" << endl;

	return 0;
}