#include <iostream>
#include <algorithm>
#include <functional>
#include <string>
#include <limits.h>
#include <vector>
#include <numeric>
using namespace std;

int main(){
	int a,b,c;
	int test1,test2;
	cin >> a >> b >> c;
	
	test1 = (a + b - 1) / b;
	test2 = (a + c - 1) / c;
	
	if((double)test1 / 3 * 2  >= test2){
		cout << "YES" << endl;
	}else{
		cout << "NO" << endl;
	}
	
	return 0;
}