using System;

namespace Izpit8
{
    internal class Program
    {
        static void Main(string[] args)
        {
            int numLocations = int.Parse(Console.ReadLine());

            for (int i = 0; i < numLocations; i++)
            {
                double goldPerDay = double.Parse(Console.ReadLine());
                int numDays = int.Parse(Console.ReadLine());
                double sumGoldForDay = 0;
                for (int k = 0; k < numDays; k++)
                {
                    double minedGoldDay = double.Parse(Console.ReadLine());
                    sumGoldForDay += minedGoldDay;   
                }
                double averageGold = sumGoldForDay / numDays;
                if (averageGold >= goldPerDay)
                {
                    Console.WriteLine($"Good job! Average gold per day: {averageGold:f2}.");
                }
                else
                {
                    Console.WriteLine($"You need {(goldPerDay - averageGold):f2} gold.");
                }
            }

        }
    }
}