#include <bits/stdc++.h>
using namespace std;
int main()
{
    int f;
    cin>>f;
    if(f>=86) cout<<"VERY GOOD";
    else  if(f>=60&&f<=85) cout<<"GOOD";
        if(f<60) cout<<"BAD";
    return 0;
}
/**************************************************************
	Problem: 1035
	User: wuweimo
	Language: C++
	Result: Accepted
	Time:21 ms
	Memory:2072 kb
****************************************************************/