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

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

	long long ba = (a + b - 1) / b;
	long long ca = (a + c - 1) / c;
	string ans ="NO";
	if( ba * 2 >= ca * 3 ) ans = "YES";

	cout << ans << endl;
}