import datetime

d = datetime.date(2015, 1, 1)
s = datetime.timedelta(days = 1)
h_day_count = 0

while d.year == 2015:
    [a, b] = divmod(d.day, 10)
    if ((a + b) == d.month):
        h_day_count += 1
    d += s

print(h_day_count)