#include<bits/stdc++.h>
using namespace std;
int main(){
	int s;
	cin>>s;
	if(s>=86){
		cout<<"VERY GOOD";
	}else if(s>=60){
		cout<<"GOOD";
	}else{
		cout<<"BAD";
	}
}
/**************************************************************
	Problem: 1035
	User: tonghuawei
	Language: C++
	Result: Accepted
	Time:20 ms
	Memory:2072 kb
****************************************************************/