#include <iostream>
#include <algorithm>
using namespace std;

int main() {
	int a, b, c;
	int need_b, need_c;
	cin >> a >> b >> c;

	double div_ab = (double)a / (double)b;
	if (div_ab != (double)(a / b)) {
		need_b = a / b + 1;
	}
	else {
		need_b = a / b;
	}

	double div_ac = (double)a / (double)c;
	if (div_ac != (double)(a / c)) {
		need_c = a / c + 1;
	}
	else {
		need_c = a / c;
	}

	if (need_b >= 1.5*need_c) {
		cout << "YES" << endl;
	}
	else {
		cout << "NO" << endl;
	}

	return 0;
}