#include<bits/stdc++.h>
using namespace std;

int main() {
	int n;
	cin>>n;
	if(n>=86){
		cout<<"VERY GOOD";
	}else if(n>=60&&n<=85){
		cout<<"GOOD";
	}else if(n<60){
		cout<<"BAD"; 
    }
return 0;
}
/**************************************************************
	Problem: 1035
	User: linmiaoling
	Language: C++
	Result: Accepted
	Time:20 ms
	Memory:2072 kb
****************************************************************/