#!/usr/bin/env python

import calendar

ans = 0
for i in range(1, 13):
    lastday = calendar.monthrange(2015,i)[1]
    for day in range(1, lastday+1):
        nums = [int(k) for k in list(str(day))]
        sumnum = 0
        for k in nums:
            sumnum += k
        if sumnum == i:
            ans += 1
print(str(ans))