Discount feature

print ("Hi, I am Marvin, your personal bot.")
users_name = input("What's your name? ")
print ("Welcome " + users_name)

print("let's do some maths")
operator = input ("Choose the operation you want to practise? ")
if operator == ("add") or operator == ("plus"):
# conditional sentence tha triggers "selection"
    print("Please, enter the numbers you want to add:")
    input1 = input("Number 1> ")
    input2 = input("Number 2> ")
    number1 = int(input1)
    number2 = int(input2)
    result = number1 + number2
    output = str(result)
    print (input1 + " + " + input2 + " = " + output)
elif operator == ("subtract"):
    print ("Please, enter the numbers you want to subtract")
    subinput1 = input("Number 1> ")
    subinput2 = input("Number 2> ")
    subnumber1 = int(subinput1)
    subnumber2 = int(subinput2)
    subresult = subnumber1 - subnumber2
    suboutput = str(subresult)
    print (subinput1 + " - " + subinput2 + " = " + suboutput)
elif operator == ("divide"):
    print ("Please, enter the numbers you want to divide")
    subinput1 = input("Number 1> ")
    subinput2 = input("Number 2> ")
    subnumber1 = int(subinput1)
    subnumber2 = int(subinput2)
    subresult = subnumber1 / subnumber2
    suboutput = str(subresult)
    print (subinput1 + " / " + subinput2 + " = " + suboutput)
elif operator == ("multiply"):
    print ("Please, enter the numbers you want to multiply")
    subinput1 = input("Number 1> ")
    subinput2 = input("Number 2> ")
    subnumber1 = int(subinput1)
    subnumber2 = int(subinput2)
    subresult = subnumber1 * subnumber2
    suboutput = str(subresult)
    print (subinput1 + " x " + subinput2 + " = " + suboutput)
elif operator == "average":
    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 = total + int(number)
    result = total / how_many
    print ("the average is " + str(result))

elif operator == "discount" or operator == "total disccount":
    count = 0
    how_many = input("How many items of shopping do you have? ")
    how_many = int(how_many)
    for item_number in range (how_many):
        item_price = input("Enter price of item " + str(item_number) + "> ")
        count = count + int(item_price)
    discount = input("What percentage is the discount?> ")
    percentage = int(discount) / 100
    result = count * percentage
    print ("The total discount of your shop is " + str(result) + "£")


else:
    print("Sorry, I don't understand that command")