import datetime
dt = datetime.datetime(year=2015, month=1, day=1)
cnt = 0
for i in range(365):
    d = dt + datetime.timedelta(days=i)
    month_ = d.month
    day_ = d.day
    day_sum = (day_//10) + (day_%10)
    # print(month_, day_, day_sum)
    if month_ == day_sum:
        cnt += 1
print(cnt)