#include<bits/stdc++.h>
using namespace std;
int main(){
	int m;
	cin>>m;
	if(m>=86){
	cout<<"VERY GOOD";
	} else if (60<=m&&m<=85){
	cout<<"GOOD";
	} else if (m<60){
	cout<<"BAD";            }
	
	
	
	
	
	
	return 0;
	
	
	
	
	
	}
/**************************************************************
	Problem: 1035
	User: zhangchenhao
	Language: C++
	Result: Accepted
	Time:21 ms
	Memory:2072 kb
****************************************************************/