day_28 = 28
day_30 = 30
day_31 = 31
cnt = 0
calendar = {1:day_31, 2:day_28, 3:day_31, 4:day_30, 5:day_31, 6:day_30, 7:day_31, 8:day_31, 9:day_30, 10:day_31, 11:day_30, 12:day_31}
for  month, day in calendar.items():
    for i in range(1, day+1):
        if i < 10:
            s = i
        else:
            s = (i//10) + (i%10)

        if month == s:
            cnt += 1
print(cnt)