#!/usr/bin/python
# -*- coding: utf-8 -*-

import calendar
ans = 0

for i in xrange(1,13):
       	max = calendar.monthrange(2015,i)[1]
       	for x in xrange(1,max+1):
       		wa = sum(map(int, str(x)))
       		if wa == i:
       			ans += 1
print ans