import datetime

date = datetime.date(2015, 1, 1)
ans = 0
while date.year ==2015:
    day = date.day
    month = date.month
    day1 = int(day/10)
    day2 = day%10
    if month == day1 + day2:
        ans += 1
    #print(date.year,date.month, date.day,ans)
    date = date + datetime.timedelta(days=1)
print(ans)