# -*- coding: utf-8 -*-
import math
happy = 0
d = [0,31,28,31,30,31,30,31,31,30,31,30,31]
for i in range(1,13):
    for j in range(1,d[i]):
        if i == j % 10 + math.floor(j / 10):
            happy += 1
print(happy)