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