using System;

    class Program
    {
        static void Main(string[] args)
        {

            int cnt = 0;

            for (int i=1; i<=12; i++)
            {
                switch (i)
                {
                    case 1:
                        for (int j = 1; j <= 31; j++)
                        {
                            calc(i, j);
                        }
                        break;
                    case 2:
                        for (int j= 1; j <= 28; j++)
                        {
                            calc(i, j);
                        }
                        break;
                    case 3:
                        for (int j = 1; j <= 31; j++)
                        {
                            calc(i, j);
                        }
                        break;
                    case 4:
                        for (int j = 1; j <= 30; j++)
                        {
                            calc(i, j);
                        }
                        break;
                    case 5:
                        for (int j = 1; j <= 31; j++)
                        {
                            calc(i, j);
                        }
                        break;
                    case 6:
                        for (int j = 1; j <= 30; j++)
                        {
                            calc(i, j);
                        }
                        break;
                    case 7:
                        for (int j = 1; j <= 31; j++)
                        {
                            calc(i, j);
                        }
                        break;
                    case 8:
                        for (int j = 1; j <= 31; j++)
                        {
                            calc(i, j);
                        }
                        break;
                    case 9:
                        for (int j = 1; j <= 30; j++)
                        {
                            calc(i, j);
                        }
                        break;
                    case 10:
                        for (int j = 1; j <= 31; j++)
                        {
                            calc(i, j);
                        }
                        break;
                    case 11:
                        for (int j = 1; j <= 30; j++)
                        {
                            calc(i, j);
                        }
                        break;
                    case 12:
                        for (int j = 1; j <= 31; j++)
                        {
                            calc(i, j);
                        }
                        break;
                }
         
            }


            Console.WriteLine(cnt);

            void calc(int num1, int num2)
            {
                int month = num1;
                string strday = num2.ToString();
                if (strday.Length == 2)
                {
                    char[] day = strday.ToCharArray();
                    int day1 = int.Parse(day[0].ToString());
                    int day2 = int.Parse(day[1].ToString());

                    if (month == day1 + day2)
                    {
                        cnt++;
                    }
                }
                else if (strday.Length == 1)
                {
                    int day1 = int.Parse(strday);
                    if (month == day1)
                    {
                        cnt++;
                    }
                }

            }
        }

    }