#include<bits/stdc++.h>
using namespace std;
int main(){
    int a;
    cin>>a;
    if(a>=86){
        cout<<"VERY GOOD"<<endl;
    }
    else if(a>=60&&a<=85){
        cout<<"GOOD"<<endl;
    }
    else if(a<60){
        cout<<"BAD"<<endl;
    } 
}
 
/**************************************************************
	Problem: 1035
	User: wengzihang
	Language: C++
	Result: Accepted
	Time:21 ms
	Memory:2072 kb
****************************************************************/