#include<bits/stdc++.h>
using namespace std;

int main(){
	int n;
	cin>>n;
	if(n>=60){
		if(n>=86){
			cout<<"VERY GOOD";
		}else{
			cout<<"GOOD";
		}
	}else{
		cout<<"BAD";
	}
	
}

/**************************************************************
	Problem: 1035
	User: linzihang
	Language: C++
	Result: Accepted
	Time:27 ms
	Memory:2072 kb
****************************************************************/