#include<bits/stdc++.h>
using namespace std;
int main(){
	int a;
	cin>>a;
	if(a>=86) swap(VERY GOOD);
	if(a>=60 a=<80) swap(GOOD);
	if(a<60) swap(BAD);
	cout<<a;
}




/**************************************************************
	Problem: 1035
	User: fandaohan
	Language: C++
	Result: Compile Error
****************************************************************/