#include<bits/stdc++.h>
using namespace std;
int main() { 
    int n;
    cin>>n;
    if(86<=n) cout<<"VERY GOOD";
    if(60<=n&&n<=85) cout<<"GOOD";
    if(n<60) cout<<"BAD";
    return 0;
}
/**************************************************************
	Problem: 1035
	User: wuhanyu
	Language: C++
	Result: Accepted
	Time:52 ms
	Memory:2072 kb
****************************************************************/