require "time"

t = DateTime.new(2015, 1, 1)

def f(x)
  res = 0
  while x > 0
    res += x % 10
    x /= 10
  end
  res
end

res = 0

while t.year == 2015
  t = t.next_day(1)
  res += 1 if t.month == f(t.day)
end

puts res