#include <iostream>
#include <algorithm>
using namespace std;

int main(){
	double a,b,c;
	cin >> a >> b >> c;
	double x = a / b;
	double y = a / c;
	x *= 2;
	x /= 3;
	y += 0.9;
	x += 0.9;
	cout << ((int)x >= (int)y ? "YES" : "NO") << endl;
	return 0;
}