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package com.izpitJecho;

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
    // write your code here
        Scanner scan = new Scanner(System.in);

        int numberLocations = Integer.parseInt(scan.nextLine());

        double averageYield = 0;
        double averageYieldCurrentLoc = 0;
        double goldPerDay = 0;

        int daysYielding = 0;

        for (int i = 0; i < numberLocations; i++) {
            averageYield = Double.parseDouble(scan.nextLine());
            daysYielding = Integer.parseInt(scan.nextLine());

            for (int j = 0; j < daysYielding; j++) {
                goldPerDay += Double.parseDouble(scan.nextLine());
            }

            averageYieldCurrentLoc = goldPerDay / daysYielding;

            if(averageYieldCurrentLoc >= averageYield){
                System.out.printf("Good job! Average gold per day: %.2f.\n", averageYieldCurrentLoc);
            }else {
                double notEnough = averageYield - averageYieldCurrentLoc;
                System.out.printf("You need %.2f gold.\n", notEnough);
                notEnough = 0;
            }

            goldPerDay = 0;
            averageYieldCurrentLoc = 0;
        }
    }
}