#include <iostream>
#include <cmath>
#include <iomanip>
using namespace std;
int main() {
	double a, b, c;
	long long p, q;
	cin >> a >> b >> c;
	p = 1000 * (a / b); q = 1000 * (a / c);
	p = (2.0 / 3) * p;
	if (q % 1000 > 0) { q = 1000 * (q / 1000 + 1); }
	if (q - p > 0) { cout << "NO" << endl; }
	else { cout << "YES" << endl; }
	return 0;
}