cnt = 0
for mo in range(1, 13):
  if mo == 2:
    num_days = 28
  elif mo in {4, 6, 9, 11}:
    num_days = 30
  else:
    num_days = 31
  for day in range(1, num_days + 1):
    dgt_sum = sum(map(int, str(day)))
    if dgt_sum == mo:
      cnt += 1
print(cnt)