def is_leap_year(given_year):
    """
    Checks if a given year denoted by 'given_year' is leap-year or not.
    Returns True if 'given_year' is leap-year.
    Returns False otherwise.
    """
    if given_year % 100 == 0:
        if given_year % 400 == 0:
            return True
        else:
            return False
    else:
        if given_year % 4 == 0:
            return True
        else:
            return False