import calendar

count = 0
num = []
for c in range(1, 13):
    for d in range(1, calendar.monthrange(2015,c)[1] + 1):
        num = [int(x) for x in list(str(d))]
        if d < 10:
            if c == num[0]:
               count += 1
               num = []
        else:
            if c == num[0] + num[1]:
                count += 1
                num = []
            else:
                num = []

print(count)