#include <iostream>
#include <cmath>
using namespace std;
int main(){
	double a,b,c;
	double normal,campaign;
	cin >> a >> b >> c;
	normal = ceil(a/b);
	campaign = ceil(a/c);
	if(normal/campaign >= 1.5)cout << "YES" <<endl;
	else cout << "NO" <<endl;
}