def main():
    months = [int(i) for i in range(1, 13)]

    days = [int(i) for i in range(1, 32)]


    count = 0
    j = 0
    while j < len(months):

        month = months[j]
        j += 1
        i = 0
        while i < len(days):

            day_str = str(days[i])
            day_sum = sum(map(int, list(day_str)))
            i += 1
            if day_sum == month:
                count += 1

    print(count - 1)


if __name__ == "__main__":
    main()