import math


def lcm(x, y):
    """
    Return least common multiple.

    https://note.nkmk.me/python-gcd-lcm/

    Parameters
    ----------
    x : int
        integer.
    y : int
        annother integer.

    Returns
    -------
    z : int
        least common multiple of x and y.

    """
    return (x * y) // math.gcd(x, y)