# -*- coding: utf-8 -*-
#No.188 HAPPY DAY

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

for i in xrange(len(month)):
    for m in xrange(month[i]):
        if m + 1 >= 10:
            if i + 1 == ((m + 1) % 10) + ((m + 1) / 10):
                #print m + 1
                c += 1
        else:
            if i + 1 == m + 1:
                #print m + 1
                c += 1

print c