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

int main(){
	cin.tie(0),ios::sync_with_stdio(false);
	int a,b,c; cin>>a>>b>>c;
	int nor=(a+b-1)/b;
	int cam=(a+c-1)/c;
	cout<<(nor*2>=cam*3?"YES"s:"NO"s)<<"\n"s;
}