import calendar, math

cnt = 0

for i in range(1, 13):
  monthdays = calendar.monthrange(2015, i)
  dd1 = (monthdays[1])

  for n in range(1, dd1+1):
    day1 = n
    if( n < 10):
      day10 = 0
    else:
      day10 = math.floor( n/10 )

      if( dd1 == (day1 + day10)):
        cnt = cnt+1

print(cnt)