cnt = 0
for month in range(1,13):

    if month in (1,3,5,7,8,10,12):
        max_day = 31
    elif month in (4,6,9,11):
        max_day = 30
    else:
        max_day = 28

    for day in range(1,max_day+1):

        #dayが1桁だったらそれがmonthと一致か
        if day//10 < 1:
            if month == day:
                cnt += 1
        #dayが2桁だったら合計がmonthと一致か
        else:
            if month == int(str(day)[0]) + int(str(day)[1]):
                cnt += 1

print(cnt)