#include<bits/stdc++.h>
using namespace std;
int main(){
int i;
cin>>i;
        if(i>=86)printf("VERY GOOD");
        else if(i<=85&&i>=60) printf("GOOD");
        else if(i<60) printf("BAD");
}
/**************************************************************
	Problem: 1035
	User: 12345678
	Language: C++
	Result: Accepted
	Time:21 ms
	Memory:2072 kb
****************************************************************/