#include <iostream>

using namespace std;

int main(int argc, const char* argv[])
{
	int a, b, c;
	cin >> a >> b >> c;
	int n0 = (a + b - 1) / b;
	int n1 = (a + c - 1) / c;
	cout << ((n0 * 2 >= n1 * 3) ? "YES" : "NO") << endl;
	return 0;
}