#include <iostream>
using namespace std;

int main(){
	int a,b,c,d;
	cin >> a >> b >> c;
	d = a / b * 2 / 3 ; 
	if(d * c > a) cout << "YES" << "\n";
	else if(d * c == a) cout << "YES" << "\n";
	else cout << "NO" << "\n";
}