target = 171

def is_leap_year (year):
    return year % 4 == 0 and (year % 100 != 0 or year % 400 == 0)

def days_since_1900 (year, month = 1, day = 1):
    days = 0

    for y in range(1900, year):
        if (is_leap_year(y)):
            days += 366
        else:
            days += 365

    for m in range(1, month):
        days += get_days_in_month(m, year)

    days += day - 1

    return days

days_in_month = [
    None,
    31,
    28,
    31,
    30,
    31,
    30,
    31,
    31,
    30,
    31,
    30,
    31,
]

week_days = [
    'mon',
    'tue',
    'wed',
    'thu',
    'fri',
    'sat',
    'sun',
]

def get_days_in_month (month, year):
    days = days_in_month[month]

    if (month == 2 and is_leap_year(year)):
        return days + 1

    return days

def get_day_of_week (year, month, day):
    days = days_since_1900(year, month, day)

    rest = days % 7

    return week_days[rest]


count = 0

for year in range(1901, 2001):
    for month in range(1, 13):
        if (get_day_of_week(year, month, 1) == 'sun'):
            count += 1

print(count)
print(count == target)