#include <bits/stdc++.h>
#define p(s) cout<<(s)<<endl
using namespace std;

int main(){
	int a,b,c;
	cin>>a>>b>>c;
	int normal=(a+b-1)/b;
	int camp=(a+c-1)/c;
	if(normal*2>=camp*3) p("YES");
	else p("NO");
	return 0;
}