using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Text;
using System.Text.RegularExpressions;
using System.Linq;


class Magatro
{
    static string N = Console.ReadLine();
 static void Main()
    {
        bool[] boolean = new bool[N.Length];
        Console.WriteLine(cnt(boolean));
    }
    static int cnt(bool[] b)
    {
        bool flag = false;
        int max = 0;
        for(int i = 0; i < N.Length-2; i++)
        {
            if (b[i]||N[i]=='0')
            {
                continue;
            }
            for(int j = i + 1; j < N.Length - 1; j++)
            {
                if (b[j] || N[i] == N[j])
                {
                    continue;
                }
                for(int k = j + 1; k < N.Length; k++)
                {
                    if (b[k] || N[k] != N[j])
                    {
                        continue;
                    }
                    flag = true;
                    int ans = int.Parse(new string(new char[] { N[i], N[j], N[k] }));
                    bool[] copy = b.ToArray();
                    copy[i] = true;
                    copy[j] = true;
                    copy[k] = true;
                    max = Math.Max(max, cnt(copy)+ans);
                }
            }
        }
        if (flag)
        {
            return max;
        }
        else
        {
            return 0;
        }
    }
}
public class Scanner
{
    private string[] S;
    private int Index;
    private char Separator;
    public Scanner(char separator=' ')
    {
        Index = 0;
        Separator = separator;
    }
    public string Next()
    {
        string result;
        if (S == null || Index >= S.Length)
        {
            S = Line();
            Index = 0;
        }
        result = S[Index];
        Index++;
        return result;
    }
    private string[] Line()
    {
        return Console.ReadLine().Split(Separator);
    } 
    public int NextInt()
    {
        return int.Parse(Next());
    }
    public double NextDouble()
    {
        return double.Parse(Next());
    }
    public long NextLong()
    {
        return long.Parse(Next());
    }
}