import calendar

count = 0
for m in range(1,13):
    date = calendar.monthrange(2015,m)[1]
    for d in range(1,date+1):
        if d < 10:
            if m == 0 + d:
                count += 1
        else:
            one_digits = int(str(d)[1])
            two_digits = int(str(d)[0])
            if m == one_digits + two_digits:
                count += 1

print(count)