bot_calculate change

total = 0
meal_total=0
cash=0

print("Hi, I am Marvin, your personal bot.")

#asks and prints users name
user_name = input ("What is your name? ")
print("Welcome " + user_name )

#input a calculation type
command = input("How can I help? ")

#when input add does an addition calculation
if command == "add":
    print("let's add some numbers")
    input1 = input("Number 1> ")
    input2 = input("Number 2> ")
    number1 = int(input1)
    number2 = int(input2)
    result = number1 + number2
    output = str(result)
    print(input1 + " + " + input2 + " = " + output)

#when input subtract does a suntraction calculation
elif command == "subtract":
    print("let's subtract some numbers")
    input1 = input("Number 1> ")
    input2 = input("Number 2> ")
    number1 = int(input1)
    number2 = int(input2)
    result = number1 - number2
    output = str(result)
    print(input1 + " - " + input2 + " = " + output)

#when input multiply does a multiply calculation
elif command == "multiply":
    print("let's Multiply some numbers")
    input1 = input("Number 1> ")
    input2 = input("Number 2> ")
    number1 = int(input1)
    number2 = int(input2)
    result = number1 * number2
    output = str(result)
    print(input1 + " * " + input2 + " = " + output)

#when input subtract does asubtraction calculation
elif command == "subtract":
    print("let's subtract some numbers")
    input1 = input("Number 1> ")
    input2 = input("Number 2> ")
    number1 = int(input1)
    number2 = int(input2)
    result = number1 - number2
    output = str(result)
    print(input1 + " - " + input2 + " = " + output)

#when input triangle calculates the are of a right angled triangle
elif command == "triangle":
    print("let's find the area of a right angled triangle")
    input1 = input("Base of the triangle> ")
    input2 = input("Height of the triangle> ")
    number1 = int(input1)
    number2 = int(input2)
    result = (number1 * 0.5) * number2
    output = str(result)
    print("(" + input1 + " * 0.5) *" + input2 + " = " + output)
# if neither add or subtract outputs an apology
elif command == "average":
    how_many = input("How many numbers> ")
    how_many = int(how_many)
    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 = " + str(result))
elif command == "change":
    meal = []
    count= 0
    meal_items=int(input("How many items in your meal list?" ))


    for item_number in range(meal_items):
        item = int(input("How much was your first item? " + str(meal_items)+""))
        meal.append(item)
        count= count +1
        meal_total=int(meal_total)+int(item)


    output = str(count)

    print(meal)

    print("You have spent " + str(meal_total) + " on your meal.")

    cash= int(input("How much cash have you given?"))

    leftover = int(cash)-int(meal_total)
    print(("You should receive $" +str(leftover)+" in your change!"))


else:
    print ("sorry I can't do that yet!!!")