using System;

namespace ConsoleApp4
{
    class Program
    {
        static void Main(string[] args)
        {

            int locations = int.Parse(Console.ReadLine());
            double goldCollected = 0;

            for (int loc = 1; loc <= locations; loc++)
            {
                goldCollected = 0;
                double expectedGold = double.Parse(Console.ReadLine());
                int daysAtaLocation = int.Parse(Console.ReadLine());

                for (int day = 1; day <= daysAtaLocation; day++)
                {
                    double goldForTheDay = double.Parse(Console.ReadLine());
                    goldCollected += goldForTheDay;
                }
                double averageGold = goldCollected / daysAtaLocation;

                if (averageGold >= expectedGold)
                {
                    Console.WriteLine($"Good job! Average gold per day: {averageGold:f2}.");
                }
                else
                {
                    Console.WriteLine($"You need {expectedGold-averageGold:f2} gold.");

                }
            }


        }
    }
}