#include <iostream>
using namespace std;

int main() {
    int score;
    cin >> score;
    
    if (score >= 86) {
        cout << "VERY GOOD";
    } else if (score >= 60) {
        cout << "GOOD";
    } else {
        cout << "BAD";
    }
    
    return 0;
}
/**************************************************************
	Problem: 1035
	User: fuhoubin
	Language: C++
	Result: Accepted
	Time:24 ms
	Memory:2072 kb
****************************************************************/