#include <bits/stdc++.h>
using namespace std;
int main(){
int a;
	cin>>a;
	if(a>=86){
		cout<<"VERY GOOD"<<endl;
	} else if(a>=60&&a<=85){
		cout<<"GOOD"<<endl;
	} else{
	cout<<"BAD"<<endl; 
	}
	return 0;
	}

/**************************************************************
	Problem: 1035
	User: mc002
	Language: C++
	Result: Accepted
	Time:21 ms
	Memory:2072 kb
****************************************************************/