#include<bits/stdc++.h>
using namespace std;
using Int = long long;
//INSERT ABOVE HERE
signed main(){
  Int a,b,c;
  cin>>a>>b>>c;
  Int x=(a+b-1)/b;
  Int y=(a+c-1)/c;
  cout<<(x*2/3>=y?"YES":"NO")<<endl; 
  return 0;
}