#include<bits/stdc++.h>
using namespace std;
int main()
{
    int a;
    cin>>a;
    if(a>=86){
    	cout<<("VERY GOOD");
    }else if(a>=60 && a<=85){
        cout<<("GOOD");	
    }else{
		cout<<("BAD")
	}	
return 0;
}

/**************************************************************
	Problem: 1035
	User: lbq001
	Language: C
	Result: Compile Error
****************************************************************/