#include<bits/stdc++.h>
using namespace std;
int main(){
	int a;
	cin>>a;
	if(a>=86) cout<<"VERY GOOD";
	if(a>=60&&a<=80) cout<<"GOOD";
	if(a<60) cout<<"BAD"<<endl;
	
}



/**************************************************************
	Problem: 1035
	User: fandaohan
	Language: C++
	Result: Wrong Answer
****************************************************************/