#include <bits/stdc++.h>
using namespace std;
int main(){
    int a;
    cin>>a;
    if(a>=86)cout<<"VERY GOOD";
	if(a<=85&&a>=60)cout<<"GOOD";
	if(a<60)cout<<"BAD";
    

}


/**************************************************************
	Problem: 1035
	User: chenmingyu
	Language: C++
	Result: Accepted
	Time:22 ms
	Memory:2072 kb
****************************************************************/