using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        int digit = Convert.ToInt32(Console.ReadLine());

        List<int> arr = new List<int>();

        while(digit != 0)

        {

            arr.Add(digit % 10);

            digit /= 10;

        }

        arr.Sort();

        int lowestDig = getIntFromList(arr);

        arr.Reverse();

        int highestDig = getIntFromList(arr);

        Console.WriteLine(lowestDig + highestDig);

    }

    static int getIntFromList(List<int> arr)

    {

        int digit = 0;

        for(int i = 0; i < arr.Count; i++)

            digit += arr[i] * (int)Math.Pow(10.0,arr.Count - i - 1);

        return digit;

    }

}