#include <bits/stdc++.h>
using namespace std;
int main(){
int a;
cin>>a;
if(a>=86)cout<<"VERY GOOD";
else if(a<=85&&a>=60)cout<<"GOOD";
	else if(a<60)cout<<"BAD";
	return 0;
	}
/**************************************************************
	Problem: 1035
	User: ljl2
	Language: C++
	Result: Accepted
	Time:23 ms
	Memory:2072 kb
****************************************************************/