#include<bits/stdc++.h>
using namespace std;
int main()
{
	int a;
	cin>>a;
	if(a>=86){
		cout<<"VERY GOOD";	
	}else if(a>=60){
			cout<<"GOOD";	
	}else if(a<60){
			cout<<"BAD";	
	}				
	return 0;
}

/**************************************************************
	Problem: 1035
	User: ccf
	Language: C++
	Result: Accepted
	Time:24 ms
	Memory:2072 kb
****************************************************************/