#include<bits/stdc++.h>
using namespace std;
int main(){
    int n;
    cin>>n;
    if(n>=86){
        cout<<"VERY GOOD"<<endl;
    }else if(n>=60){
        cout<<"GOOD"<<endl;
    }else{
        cout<<"BAD"<<endl;
    }
}
/**************************************************************
	Problem: 1035
	User: wangchenyu
	Language: C++
	Result: Accepted
	Time:38 ms
	Memory:2072 kb
****************************************************************/