Calculator in Python

num1 = input("Enter a number: ")
num2 = input("Enter another number: ")
calculator = input("Enter 'add', 'subtract', 'multiply', or 'divide': ")

if calculator == "add":
    result = int(num1) + int(num2)
    print(result)
elif calculator == "subtract":
    result = int(num1) - int(num2)
    print(result)
elif calculator == "multiply":
    result = int(num1) * int(num2)
    print(result)
elif calculator == "divide":
    result = int(num1) / int(num2)
    print(result)
else:
    print("That is not a valid method of math!")