#include<bits/stdc++.h>
using namespace std;
int main(){
	int a;
	cin>>a;
	if(a>=86){
	cout<<"VERY GOOD";
	}
	if(85>=a>=60){
	cout<<"GOOD";
	}
	if(a<60){
	cout<<"BAD";
	}	 
}
/**************************************************************
	Problem: 1035
	User: tonghuawei
	Language: C++
	Result: Wrong Answer
****************************************************************/