def happyday():
    months = range(1,13)
    count = 0
    for month in months:
        if month in [1,3,5,7,8,10,12]:
            days = range(1,32)
        elif month in [4,6,9,11]:
            days = range(1,31)
        else:
            days = range(1,29) # 2015年なので閏年でない

        for day in days:
            if month < 10:
                if month == day or month == (day // 10 + day % 10):
                    count += 1
            else:
                if month == (day // 10 + day % 10):
                    count += 1
    print(count)

happyday()