finished = False
while finished == False:
    print("Hi, I am Jenny, your personal bot.")
    command = input("How can I help? ")
    # code for adding numbers
    if command == "add":
        print("Let's add some numbers!")
        users_name = input("What is your name? ")
        print("Welcome to Math world, " + users_name)
        print("Let's add some numbers.")
        input1 = input("Number1- ")
        input2 = input("Number2- ")
        input3 = input("Number3- ")
        number1 = int(input1)
        number2 = int(input2)
        number3 = int(input3)
        result = number1 + number2 + number3
        output = str(result)
        print(input1 + "+" + input2 + "+" + input3 + "=" + output)
    # elif is like having possibilities other than the first one
    # code for subtracting numbers
    elif command == "subtract":
        print("Let's subtract some numbers.")
        input1 = input("Number1- ")
        input2 = input("Number2- ")
        number1 = int(input1)
        number2 = int(input2)
        result = number1 - number2
        output = str(result)
        print(input1 + "-" + input2 + "=" + output)

    # code for multiplying numbers
    elif command == "multiply":
        print("Let's multiply some numbers.")
        input1 = input("Number1- ")
        input2 = input("Number2- ")
        number1 = int(input1)
        number2 = int(input2)
        result = number1*number2
        output = str(result)
        print(input1 + "X" + input2 + "=" + output)

    # code for dividing numbers
    elif command == "division":
        print("Let's divide some numbers.")
        input1 = input("Number1- ")
        input2 = input("Number2- ")
        number1 = int(input1)
        number2 = int(input2)
        result = number1/number2
        output = str(result)
        print(input1 + "/" + input2 + "=" + output)

    # code for calculating area of a triangle
    elif command == "area of a triangle":
        print("Let's calculate the area of a triangle.")
        print("The formula for the area of a triangle is: 1/2 X Base X Height.")
        input1 = input("Base- ")
        input2 = input("Height- ")
        number1 = int(input1)
        number2 = int(input2)
        result = (1/2)*number1*number2
        output = str(result)
        print("1/2 X " + input1 + "X" + input2 + "=" + output)

    # code for finding average
    elif command == "average":
        print("Let's learn about 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=" + str(result))

    # to create a shopping list
    elif command == "create shopping list":
        print("Let's create a shopping list.")
    shopping = []
    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 = input("What is the item number " + str(item_number) + "?")
        shopping.append(item)
        count = count + 1

    output = str(count)
    print(shopping)
    print("You have " + output + " items in your shopping list.")
    elif command == "bye":
        finished = True
    else:
        print("I don't understand")