#include<iostream>
#include<cmath>

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

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

	int d = ceil(a / c);

	if (ceil(a / b * 2 / 3) <= d)
		std::cout << "YES" << std::endl;
	else
		std::cout << "NO" << std::endl;

	return 0;
}