Gold Mine

using System;

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

            for (int i = 0; i < locations; i++)
            {
                double averageGold = double.Parse(Console.ReadLine());
                int dayDigging = int.Parse(Console.ReadLine());
                double goldSum = 0;

                for (int j = 0; j < dayDigging; j++)
                {
                    goldSum += double.Parse(Console.ReadLine()); ;
                }

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