count = 0
for i in range(1, 13):
  if i in (1, 3, 5, 7, 8, 10, 12):
    for j in range(1, 32):
      if j >= 10:
        if i == int(str(j)[1]) + int(str(j)[0]):
          count += 1
      else:
        if i == j:
          count += 1
  elif i == 2:
    for j in range(1, 29):
      if j >= 10:
        if i == int(str(j)[1]) + int(str(j)[0]):
          count += 1
      else:
        if i == j:
          count += 1
  else:
    for j in range(1, 31):
      if j >= 10:
        if i == int(str(j)[1]) + int(str(j)[0]):
          count += 1
      else:
        if i == j:
          count += 1
print(count)