using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main(string[] args)
    {
        var N = int.Parse(Console.ReadLine());
        var list = new List<int>();
        for (int i = 1; i <= 8; i++)
        {
            for (int j = i + 1; j <= 9; j++)
            {
                var X = 10 * i + j;
                list.Add(X);
            }
        }

        var r = N % list.Count;
        if (r == 0) r = list.Count;
        var seed = list[r - 1];
        var times = (N - 1) / list.Count;
        Console.Write(seed);
        var b = seed % 10;
        for (int i = 0; i < times; i++)
        {
            Console.Write(b);
        }
        Console.WriteLine();
    }
}