#include<bits/stdc++.h> 
using namespace std;
int main(){
	int a;
	cin>>a;
	if(a>=86) cout<<"VERY GOOD";
	if(a>=60 && a<=85) cout<<"GOOD";
	if(a<60) cout<<"BAD"; 
	return 0;
}
/**************************************************************
	Problem: 1035
	User: cyp
	Language: C++
	Result: Accepted
	Time:24 ms
	Memory:2072 kb
****************************************************************/