#include<iostream>
#include<cmath>

int main() {
	double a, b, c;

	std::cin >> a >> b >> c;

	if ((ceil(a / b) * 2.0 / 3) >= ceil(a / c))
		std::cout << "YES" << std::endl;
	else
		std::cout << "NO" << std::endl;

	return 0;
}