def day_name(num):
    """ Get day from int """
    if num == 0:
        return "Sunday"
    elif num == 1:
        return "Monday"
    elif num == 2:
        return "Tuesday"
    elif num == 3:
        return "Wednesday"
    elif num == 4:
        return "Thursday"
    elif num == 5:
        return "Friday"
    elif num == 6:
        return "Saturday"
    else:
        return None