import calendar

def days_2015(m):
	month = calendar.monthcalendar(2015, m)
	month_set = []
	for i in month:
		month_set.extend(i)

	month_set = list(set(month_set))
	return month_set

full_days_lists = []
for i in range(1, 13):
	full = days_2015(i)
	full_days_lists.append(full)

month_end = []
for i in range(len(full_days_lists)):
        month_end.append(full_days_lists[i][-1])

count = 0
for i in range(len(month_end)):
	if i == 0:
		pass
	for j in range(month_end[i]):
		if i < 10 and i == j:
			count += 1
		elif j >= 10:
			days = ((j // 10) + (j % 10))
			if i == days:
				count += 1

print(count)