# coding: utf-8
# Your code here!

lastDay = [31,28,31,30,31,30,31,31,30,31,30,31]
ct = 0

for i in range(1,13):
    for j in range(1,lastDay[i-1]+1):
        temp1 = i
        temp2 = (j // 10) + (j % 10)
        if temp1 == temp2:
            ct += 1

print(ct)