from Queue import * # Queue, LifoQueue, PriorityQueue
from bisect import * #bisect, insort
from collections import * #deque, Counter,OrderedDict,defaultdict
#set([]) 
import math
import copy
import itertools
import string
import sys
import datetime
myread = lambda : map(int,raw_input().split())
def solver():
    d = datetime.date(2015,1,1)
    ans = 0
    while d.year != 2016:
        day = d.day
        month = d.month
        if month == day / 10 + day % 10:
            ans += 1
        d += datetime.timedelta(days=1)

    print ans
if __name__ == "__main__":
    solver()