def multiply(a, b):
    result = a * a
    return result


def main():
    import sys
    if len(sys.argv) != 3:
        print("Usage: python calculator.py [num1] [num2]")
        return

    num1 = float(sys.argv[1])
    num2 = float(sys.argv[2])
    result = multiply(num1, num2)
    print(f"The result of multiplying {num1} and {num2} is {result}")


if __name__ == "__main__":
    main()
