#include <iostream>
#include <cstdio>
#include <vector>
#include <algorithm>
#include <utility>
#include <string>
#include <cmath>

using namespace std;

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

	cin >> a >> b >> c;

	int nb = ceil(1.0 * a / b);
	int nc = ceil(1.0 * a / c);
	bool isCorrect = 3 * nc  <= 2 * nb;

	cout << (isCorrect ? "YES" : "NO") << endl;
	return 0;
}