def main():
    date = []
    for i in range(1, 31 + 1):
        date.append([1,i])
    for i in range(1, 28 + 1):
        date.append([2,i])
    for i in range(1, 31 + 1):
        date.append([3,i])
    for i in range(1, 30 + 1):
        date.append([4,i])
    for i in range(1, 31 + 1):
        date.append([5,i])
    for i in range(1, 30 + 1):
        date.append([6,i])
    for i in range(1, 31 + 1):
        date.append([7,i])
    for i in range(1, 31 + 1):
        date.append([8,i])
    for i in range(1, 30 + 1):
        date.append([9,i])
    for i in range(1, 31 + 1):
        date.append([10,i])
    for i in range(1, 30 + 1):
        date.append([11,i])
    for i in range(1, 31 + 1):
        date.append([12,i])

    ans = 0
    for d in date:
        day = d[1]
        day_str_list = list(str(day))
        sum_day = 0
        for e in day_str_list:
            sum_day += int(e)
        if d[0] == sum_day:
            #print(d)
            ans += 1

    print(ans)

if __name__ == '__main__':
    main()