#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,b,c;
	cin>>a;
	if(a>=86) {
		cout<<"VERY GOOD";
	}
	if(a<=85&&a>=60) {
		cout<<"GOOD";
	}
	if(a<60) {
		cout<<"BAD";
	} 
}
/**************************************************************
	Problem: 1035
	User: toughuatao1
	Language: C++
	Result: Accepted
	Time:23 ms
	Memory:2072 kb
****************************************************************/