#include<iostream>
#include<string>
using namespace std;
int main()
{
	int a, b, c, mb, mc;
	cin >> a >> b >> c;
	mb = (a + b - 1) / b;
	mc = (a + c - 1) / c;
	string ans = (2 * mb < 3 * mc) ? "NO" : "YES";
	cout << ans << endl;
	return 0;
}