#include <iostream>
#include <cmath>
#include <iomanip>
using namespace std;
int main() {
	int a, b, c;
	double p, q;
	cin >> a >> b >> c;
	double test = (double)a/b;
	double check = test - a / b;

	p = (double)a / c;
	q = p - a / c;

	//cout << q << endl;
	if (q > 0) { p = (int)(a / c + 1); }
	if (p - (2 * a) / (3 * b)) {
		cout << "NO" << endl;
	}
	else {
		cout << "YES" << endl;
	}

	return 0;
}