day = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
ans = 0
for m in range(12):
  for d in range(day[m]):
    td = d + 1
    s = 0
    while td > 0:
      s += td % 10
      td //= 10
    if s == m + 1:
      ans += 1
      #print("{:02d}/{:02d}".format(m + 1, d + 1))
print(ans)