import sys
from collections import deque,defaultdict
import itertools
import heapq
import bisect
import math

#sys.setrecursionlimit(10 ** 9)
input = lambda: sys.stdin.readline().rstrip()
ii = lambda: int(input())
mi = lambda: map(int, input().split())
ml = lambda: map(str, input().split())
li = lambda: list(mi())
li_st = lambda: list(map(str, input().split()))
lli = lambda n: [li() for _ in range(n)]
mod = 998244353

ans = 0
lis = [31,28,31,30,31,30,31,31,30,31,30,31]

for i in range(12):
    num1 = i+1
    for j in range(1,lis[i]+1):
        s = str(j)
        if len(s) >= 2:
            num2 = int(s[0]) + int(s[1])
        else:
            num2 = j
        if num1 == num2:
            ans += 1

print(ans)