using System;


class Program
{
    static void Main()
    {
        int n = Convert.ToInt32(Console.ReadLine());
        if (n == 1)
        {
            Console.WriteLine(9);
            return;
        }
        ulong result = 9;
        for (int i = 2; i <= n; i++)
        {
            if (i % 2 == 0)
            {
                result +=  9 * (ulong)Math.Pow(10, i/2 - 1);
            }
            else
            {
               result += 90 * (ulong)Math.Pow(10, (i-1)/2-1);
            }
            result = result > 10000007 ? module(result): result;

        }
        Console.WriteLine(result);
    }

    static ulong module(ulong a)
    {
        return a % ((ulong) Math.Pow(10,9)+7);
    }
}