happy_day = 0
month = [31, 30, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]

for i in range(len(month)):
	for j in range(month[i]):
		day = str(j)
		a = int(day[0:1])
		b = int(day[1:2]) if day[1:2] else 0
		
		if i == a + b:
			happy_day += 1
		

print(happy_day)