#include <bits/stdc++.h>
using namespace std;
int main()
{
	int f;
	cin>>f;
	if(f>=86) cout<<"YERY GOOD";
	if(f>=60&&f<=85) cout<<"GOOD";
	if(f<60) cout<<"BAD";
	return 0;
}

/**************************************************************
	Problem: 1035
	User: ccf
	Language: C++
	Result: Wrong Answer
****************************************************************/