import calendar

c = calendar.Calendar()

total = 0
for i in range(1, 13):
    m = c.monthdatescalendar(2015, i)
    for a in m:
        for b in a:
            if b.year == 2015:
                split_day = str(b.day).zfill(2)
                if i == int(split_day[0]) + int(split_day[1]):
                    total += 1
print(total)