#include<bits/stdc++.h>
using namespace std;
int main()
{
      int m;
      cin>>m;
      if(m>=86){ 
      	cout<<"VERY GOOD"<<endl;
      }else if(m>=60){
      	cout<<"GOOD"<<endl;
      }else{
      	cout<<"BAD"<<endl;
      }

















	return 0;
}

/**************************************************************
	Problem: 1035
	User: czr
	Language: C
	Result: Compile Error
****************************************************************/