#include<bits/stdc++.h>
using namespace std;
int main(){
	int a;
	cin>>a;
	if(a>=86) cout<<"VERY GOOD"<<endl;
	else if(a<=85,a>=60) cout<<"GOOD"<<endl;
	else cout<<"BAD"<<endl;
}
/**************************************************************
	Problem: 1035
	User: xiaojingxuan
	Language: C++
	Result: Accepted
	Time:24 ms
	Memory:2072 kb
****************************************************************/