#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: zhangyilei
	Language: C++
	Result: Accepted
	Time:28 ms
	Memory:2072 kb
****************************************************************/