import calendar
c = calendar.Calendar()
q = 0
i = 1
while i <= 12:
    for d in c.itermonthdays(2015, i):
            if d != 0:
                if d < 10:
                    d = "0" + str(d)
                l = [int(x) for x in list(str(d))]
                if i == int(l[0]) + int(l[1]):
                    q += 1
    i += 1
print(q)