class Program
{
    static void Main(string[] args)
    {
        int count = 0;
        for (int i = 1; i <= 12; i++)
        {
            for (int j = 1; j <= 31; j++)
            {
                
                if (j >= 10)
                {
                    int oneDigits = j / 10;
                    int twoDigits = j % 10;

                    int sum = oneDigits + twoDigits;

                    if (sum == i)
                    {
                        count++;
                    }
                }
                else if (i == j)
                {
                    count++;
                }
            }
        }

        Console.WriteLine(count);
    }
}