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

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