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