# -*- coding: utf-8 -*-
import datetime

def is_date(year, month, day):
    try:
        datetime.date(year, month, day)
        return True
    except ValueError:
        return False

result = 0
# 1 - 12
for x in range(1,13):
    # 0 - 3
    for a in range(4):
        b = x - a
        if b < 0 or 9 < b:
            continue
        y = int(str(a) + str(b))
        if is_date(2015, x, y):
            result += 1

print(result)