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

/**************************************************************
	Problem: 1035
	User: ct001
	Language: C++
	Result: Accepted
	Time:18 ms
	Memory:2072 kb
****************************************************************/