#coding: UTF-8

import sys
import re
import itertools
from math import log
from collections import deque

### defs ###


### main ###
ans=0
month = [31,28,31,30,31,30,31,31,30,31,30,31]
for i in range(1,13):
	m = month[i-1]
	ans += len(list(filter(lambda x:i==x%10+x//10, range(1,m+1))))
print(ans)