#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: panjinyan
	Language: C++
	Result: Accepted
	Time:30 ms
	Memory:2072 kb
****************************************************************/