#include <iostream>
using namespace std;
int main(){
	int a;
	cin >> a;
	int b;
	cin >> b;
	int c;
	cin >> c;
	if ((a + b - 1) / b * 2 >= (a + c - 1) / c * 3){
		cout << "YES" << endl;
	} else {
		cout << "NO" << endl;
	}
}