lets add some number python bot

print("Hi, I am Marvin, your personal bot.")
command = input("How can I help? ")
if command == "add" or "plus" or "sum":
    print("lets 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)