#include <bits/stdc++.h>
#define PI 3.14159265359
using namespace std;

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

	double n, m;
	n = ceil(a / b);
	m = ceil(a / c);

	bool bl = false;
	if (m / n <= 2.0 / 3.0) bl = true;

	cout << (bl ? "YES" : "NO") << endl;
}