#include<bits/stdc++.h>
using namespace std;
int main(){
int i;
cin>>i;
		if(i>=86)printf("VERY GOOD");
		else if(i<=85&&i>=60) printf("GOOD");
		else if(i<60) printf("BAD");
}


/**************************************************************
	Problem: 1035
	User: shenyue
	Language: C++
	Result: Accepted
	Time:21 ms
	Memory:2072 kb
****************************************************************/