#include"bits/stdc++.h"
using namespace std;
int main() {
	int a, b, c; cin >> a >> b >> c;
	int m = (a + b - 1) / b;
	int g = (a + c - 1) / c;
	if (g <= 2.0*m / 3.0)cout << "YES" << endl;
	else cout << "NO" << endl;
}