#include<bits/stdc++.h>
using namespace std;
int main(){
    int n;
    cin>>n;
    if(n>=86){
    	cout<<"VERY GOOD";
    }else{
    	if(n>=60&&n<=85){
    		cout<<"GOOD";
    	}else{
    		cout<<"BAD";
    	}
    }
}
/**************************************************************
	Problem: 1035
	User: linyuhang
	Language: C++
	Result: Accepted
	Time:25 ms
	Memory:2072 kb
****************************************************************/