#include<bits/stdc++.h>
using namespace std;
int main(){
    int f;
	cin>>f;
	if(f>=85){
		cout<<"VERY GOOD";
	}else if(f>=60&&f<=85){
		cout<<"GOOD";
	}else{
		cout<<"BAD";
	} 
}
/**************************************************************
	Problem: 1035
	User: xuezihong1
	Language: C++
	Result: Wrong Answer
****************************************************************/