goldmine

number_of_locations = int(input())

for each_location in range(number_of_locations):
    expected_average_gold_per_day = float(input())
    number_of_days = int(input())
    total_gold = 0
    for each_day in range(number_of_days):
        gold_per_day = float(input())
        total_gold += gold_per_day
    if total_gold / number_of_days >= expected_average_gold_per_day:
        print(f"Good job! Average gold per day: {total_gold / number_of_days:.2f}.")
    else:
        print(f"You need {(expected_average_gold_per_day - total_gold / number_of_days):.2f} gold.")