#include<bits/stdc++.h>
using namespace std;
int main(){
    int n;
	cin>>n;
	if(n>=60){
		cout<<"GOOD";
		if(n>=86){
			cout<<"VERY GOOD";
		}else{
			cout<<"BAD";
	
		
		}
	}
/**************************************************************
	Problem: 1035
	User: chenyaohuo
	Language: C++
	Result: Compile Error
****************************************************************/