using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Threading.Tasks;
using AtCoderBeginnerContest161.Questions;
using AtCoderBeginnerContest161.Extensions;

namespace AtCoderBeginnerContest161
{
    class Program
    {
        static void Main(string[] args)
        {
            IAtCoderQuestion question = new QuestionD();    // 問題に合わせて書き換え
            var answers = question.Solve(Console.In);
            foreach (var answer in answers)
            {
                Console.WriteLine(answer);
            }
        }
    }
}

namespace AtCoderBeginnerContest161.Questions
{
    // ここにQuestionクラスをコピペ
    public class QuestionD : AtCoderQuestionBase
    {
        public override IEnumerable<string> Solve(TextReader inputStream)
        {
            var k = inputStream.ReadInt();

            long lunlun = 0;
            for (int i = 0; i < k; i++)
            {
                lunlun = GetNextLunlunNumber(lunlun);
            }

            yield return lunlun.ToString();
        }

        long GetNextLunlunNumber(long lunlunNumber)
        {
            var incrementedDigit = GetNextIncrementedDigit(lunlunNumber);
            var pow = (long)Math.Pow(10, incrementedDigit);
            var nextLunlunNumber = (lunlunNumber / pow + 1) * pow;
            var previous = (nextLunlunNumber / pow) % 10;

            for (long digit = incrementedDigit - 1; digit >= 0; digit--)
            {
                var current = Math.Max(previous - 1, 0);
                nextLunlunNumber += current * (long)Math.Pow(10, digit);
                previous = current;
            }

            return nextLunlunNumber;
        }

        long GetNextIncrementedDigit(long lunlunNumber)
        {
            var digit = 0;

            if (lunlunNumber < 10)
            {
                return digit;
            }

            var n = lunlunNumber;
            var previous = n % 10;
            n /= 10;

            while (n != 0)
            {
                var current = n % 10;

                if (previous <= current && previous != 9)
                {
                    return digit;
                }

                n /= 10;
                digit++;
                previous = current;
            }

            return digit;
        }
    }


    #region Base Classes

    public interface IAtCoderQuestion
    {
        IEnumerable<string> Solve(string input);
        IEnumerable<string> Solve(TextReader inputStream);
    }

    public abstract class AtCoderQuestionBase : IAtCoderQuestion
    {
        public IEnumerable<string> Solve(string input)
        {
            var stream = new MemoryStream(Encoding.Unicode.GetBytes(input));
            var reader = new StreamReader(stream, Encoding.Unicode);

            return Solve(reader);
        }

        public abstract IEnumerable<string> Solve(TextReader inputStream);
    }

    #endregion
}

#region Extensions

namespace AtCoderBeginnerContest161.Extensions
{
    internal static class TextReaderExtensions
    {
        internal static int ReadInt(this TextReader reader) => int.Parse(ReadString(reader));
        internal static long ReadLong(this TextReader reader) => long.Parse(ReadString(reader));
        internal static double ReadDouble(this TextReader reader) => double.Parse(ReadString(reader));
        internal static string ReadString(this TextReader reader) => reader.ReadLine();

        internal static int[] ReadIntArray(this TextReader reader, char separator = ' ') => ReadStringArray(reader, separator).Select(int.Parse).ToArray();
        internal static long[] ReadLongArray(this TextReader reader, char separator = ' ') => ReadStringArray(reader, separator).Select(long.Parse).ToArray();
        internal static double[] ReadDoubleArray(this TextReader reader, char separator = ' ') => ReadStringArray(reader, separator).Select(double.Parse).ToArray();
        internal static string[] ReadStringArray(this TextReader reader, char separator = ' ') => reader.ReadLine().Split(separator);
    }
}

#endregion

Measured memory_bytes: 13140