#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";
 	
 	
 	
}
/**************************************************************
	Problem: 1035
	User: zhuangwenya
	Language: C++
	Result: Accepted
	Time:21 ms
	Memory:2072 kb
****************************************************************/