# coding: utf-8
import calendar

month = 12
y = 2015
happy_ct = 0

for i in range(1,month + 1):
    last_day_num = calendar.monthrange(y,i)[1]
    
    for j in range(1,last_day_num):
        j_1 = j // 10
        j_2 = j % 10
        j_sum = j_1 + j_2
        
        if i == j_sum:
            happy_ct += 1

print(happy_ct)