#include <bits/stdc++.h>
using namespace std;

int main(){
	int a,b,c; cin>>a>>b>>c;
	int ab=(a+(b-1))/b;
	int ac=(a+(c-1))/c;
	if((double)ac/ab<=(double)2/3) cout<<"YES"<<endl;
	else cout<<"NO"<<endl;
}