day_list = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
count = 0

for month in range(12):
	for day in range(day_list[month]):
		day_sum = day // 10 + day % 10
		if day_sum == (month+1):
			count = count + 1
print(count)