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



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