import datetime

ans = 0
now_date = datetime.datetime(2015, 1, 1)
end_date = datetime.datetime(2015, 12, 31)
while True:
    month = now_date.month
    day = now_date.day
    digit_sum = eval("+".join(str(day)))
    if month == digit_sum:
        ans += 1
    now_date += datetime.timedelta(days=1)
    if now_date > end_date:
        break
print(ans)