def do_calculation():
    print("lets do some " + command + " calculation.")
#ask user how many numbers  wants
    how_many = input("How many numbers> ")
    how_many = int(how_many)
    total = 0
    for number_count in range(how_many):
        number = input("Enter number " + str(number_count) + "> ")
#total = adding total to integer number which user has input
        total = total + int(number)
#result is total divide to variable(how_many) which stores amount of numbers input by user
        result = total / how_many
    if command == "average":
        print("the average = " + str(result))
    elif command == "total":
#prints total
        print("total = " + str(total))
finished = False
while finished == False:
    print("Hi, I am Marvin, your personal bot.")
    command = input("How can I help? ")
    if command == "average":
        do_calculation()
    elif command == "total":
        do_calculation()
    elif command == "bye":
        finished = True
    else:
        print("sorry I dont understand")