days_31 = []
days_30 = []
days_28 = []
month = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]
b = [4, 6, 9, 11]
count = 0
for i in range(1, 32):
  days_31.append(i)

for i in range(1, 31):
  days_30.append(i)

for i in range(1, 29):
  days_28.append(i)

for i in month:
  if i == 2:
    for d in days_28:
      if d < 10:
        if i == d:
          count += 1
      else:
        if i == int(str(d)[0]) + int(str(d)[1]):
          count += 1 
  elif i in b:
    for d in days_30:
      if d < 10:
        if i == d:
          count += 1
      else:
        if i == int(str(d)[0]) + int(str(d)[1]):
          count += 1
  else:
    for d in days_31:
      if d < 10:
        if i == d:
          count += 1
      else:
        if i == int(str(d)[0]) + int(str(d)[1]):
          count += 1 

print(count)