#include <iostream>
using namespace std;
int main(void) {
	int a, b, c;
	cin >> a >> b >> c;
	double
		d = (a + b - 1) / b * 2 / 3,
		e = (a + c - 1) / c;
	cout << (e <= d ? "YES" : "NO") << endl;
	return 0;
}