ZFTSH Programming Elements Task 3

def leap(year):
    if (year % 4 == 0 and year % 100 != 0) or year % 400 == 0: return True
    return False

def month_days(month):
    global year
    if month == 1: return 0
    if month == 3:
        if leap(year): return month_days(month-1) + 29
        return month_days(month-1) + 28
    if month in (2, 4, 6, 8, 9, 11):
        return month_days(month-1) + 31
    return month_days(month-1) + 30

def year_days(year):
    year -= 1
    k400 = year // 400
    k100 = year // 100
    k4 = year // 4
    leaps_years = k4 - k100 + k400 - 1
    return 366 * (leaps_years) + 365 * (year - leaps_years)

day, month, year = map(int, input().split('.'))


if day == 29 and month == 2 and not leap(year) or month in (2, 4, 6, 9, 11) and day > 30 or day > 31 or month > 12:
    print('Неверная дата')
else:
    date = day
    date += month_days(month)
    date += year_days(year)
    week = ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday']
    #week = ['Понедельник', 'Вторник', 'Среда', 'Четверг', 'Пятница', 'Суббота', 'Воскресенье']
    print(week[date % 7])