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

int main(){
	int a,b,c;
	cin >> a >> b >> c;
	int x = (a+b-1)/b;
	int y = (a+c-1)/c;
	//cout << x << " " << y << endl;
	puts(x*2 >= y*3 ? "YES" : "NO");
}