Задача 3

# https://lifehacker.ru/kakoj-den-nedeli

day = int(input("День: "))
month = int(input("Месяц: "))
year = int(input("Год: "))


def is_year_leap(year_num):
    return (year_num % 4 == 0 and year_num % 100 != 0) or (year_num % 400 == 0)


def get_month_code(month_num, year_num):
    if month_num == 1:
        if is_year_leap(year_num):
            return 0
        else:
            return 1
    elif month_num == 2:
        if is_year_leap(year_num):
            return 3
        else:
            return 4
    elif month_num == 3:
        return 4
    elif month_num == 4:
        return 0
    elif month_num == 5:
        return 2
    elif month_num == 6:
        return 5
    elif month_num == 7:
        return 0
    elif month_num == 8:
        return 3
    elif month_num == 9:
        return 6
    elif month_num == 10:
        return 1
    elif month_num == 11:
        return 4
    elif month_num == 12:
        return 6


def get_century_code(year_num):
    n = year_num // 100 % 4
    if n == 0:
        return 6
    elif n == 1:
        return 4
    elif n == 2:
        return 2
    elif n == 3:
        return 0


def get_year_code(year_num):
    return (get_century_code(year_num) + year_num % 100 + year_num % 100 // 4) % 7


result = (day + get_month_code(month, year) + get_year_code(year)) % 7
if result == 2:
    print("Понедельник")
elif result == 3:
    print("Вторник")
elif result == 4:
    print("Среда")
elif result == 5:
    print("Четверг")
elif result == 6:
    print("Пятница")
elif result == 0:
    print("Суббота")
elif result == 1:
    print("Воскресенье")