#include <iostream>
using namespace std;
int main() {
	double a, b, c;
	cin >> a >> b >> c;
	if (a / c - (2.0 * a) / (3.0 * b) >= 0.0) {
		cout << "NO" << endl;
	}
	else {
		cout << "YES" << endl;
	}
	return 0;
}