Gold Mine

locations = int(input())

for place in range(1, locations + 1):
    expected = float(input())
    days = int(input())
    count = 0
    for x in range(1, days + 1):
        gold_per_day = float(input())
        count += gold_per_day
    average_per_location = count / days
    if average_per_location >= expected:
        print(f"Good job! Average gold per day: {average_per_location:.2f}.")
    if average_per_location < expected:
        difference = expected - average_per_location
        print(f"You need {difference:.2f} gold.")