print("Hi, I am Marvin, your personal bot.")
command = input("How can I help? ")
if command == "calculate tip" or command == "tip":
    print("lets crunch some numbers")
    input1 = input("Amount paid > ")
    input2 = input("Tip percentage (using a decimal) > ")
    number1 = int(input1)
    number2 = float(input2)
    result = number1 * number2
    output = str(result)
    print(input1 + " * " + input2 + " = " + output)