#include <bits/stdc++.h>
using namespace std;
int main(){
    int a;
    cin<<a;
    if(a<=86)cout<<" VERY GOOD";
	if(a<=80)cout<<"GOOD";
	if(a<60)cout<<" BAD";
    

}

/**************************************************************
	Problem: 1035
	User: chenmingyu
	Language: C++
	Result: Compile Error
****************************************************************/