# -*- coding: utf-8 -*-
import datetime

# 1. HAPPY DAYの個数をカウント.
ans = 0
fTime = datetime.datetime(2015, 1, 1, 0, 0, 0)
lTime = datetime.datetime(2015, 12, 31, 11, 59, 59)

for i in range(366):
  today = fTime + datetime.timedelta(days=i)
  if today > lTime:
    break
  m = int(today.month)
  d = int(today.day)
  qD, modD = divmod(d, 10)
  if m == (qD + modD):
    ans += 1

# 2. 出力.
print(ans)