#include <iostream>
#include <cmath>
#include <iomanip>
using namespace std;
int main() {
	double a, b, c;
	double p, q;
	cin >> a >> b >> c;
	p = a / b; q = a / c;
	p = ceil(p); q = ceil(q);
	p = 2 * p / 3;
	if (p >= q) {
		cout << "YES" << endl;
	}
	else {
		cout << "NO" << endl;
	}
	return 0;
}