month = [0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]

def happyday(m, d):
	dd = [0, 0]
	if d < 10:
		dd = [0, d]
	else:
		ds = str(d)
		dd = [int(d[0]), int(d[1])]
	return m == dd[0] + dd[1]

cnt = 0
for i in range(1, 13):
	for j in range(1, month[i]+1):
		if happyday(i, j):
			cnt += 1

print cnt