def tashizan(a, b):
    """calculate a+b

    :param a: value 1(int)
    :param b: value 2(inte)
    :return: a + b
    """
    return a + b


def hikizan(a, b):
    """calculate a - b

    :param a:  value 1(int)
    :param b:  value 2(int)
    :return:  a - b
    """
    return a - b
