#!/usr/bin/env python3
# -*- coding: utf-8-*-
if __name__ == '__main__':
    a = 0
    l = [31,28,31,30,31,30,31,31,30,31,30,31]
    for i in range(12):
        for j in range(l[i]):
            if i == j%10+j//10:
                a += 1
    print(a)