using System;
using System.Collections.Generic;
using System.IO;
class Solution {
    static void Main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution */
        int[] rs = new int[9];
        
        for(int i =0; i < 3;i++)
        {
          var strline = Console.In.ReadLine();
          var splits =  strline.Split(' ');
          for(int j = 0 ; j  < splits.Length;j++)
          {
              rs[3*i+j] = int.Parse(splits[j]);
          }  
        }
        int[][] targuets = new int[8][];
        targuets[0] = GetVariant(8,1,6,3,5,7,4,9,2);
        targuets[1] = GetVariant(6,1,8,7,5,3,2,9,4);
        targuets[2] = GetVariant(8,3,4,1,5,9,6,7,2);
        targuets[3] = GetVariant(6,7,2,1,5,9,8,3,4);
        targuets[4] = GetVariant(4,9,2,3,5,7,8,1,6);
        targuets[5] = GetVariant(2,9,4,7,5,3,6,1,8);
        targuets[6] = GetVariant(4,3,8,9,5,1,2,7,6);
        targuets[7] = GetVariant(2,7,6,9,5,1,4,3,8);
        
        
        int min = int.MaxValue;
        
        for(int i =0; i < targuets.Length;i++)
        {
            int currentdif = 0;
            for(int j =0; j < 9;j++)
            {
                currentdif = currentdif + Math.Abs(targuets[i][j] - rs[j]);
            }    
            if (currentdif < min)
            {
             min =     currentdif;
            }
        }
   
        
        
        
        
        Console.Out.WriteLine(min);
        
        
    }
    
    public static int[] GetVariant(int p1, int p2,int p3, int p4, int p5, int p6, int p7, int p8, int p9)
    {
        int[] targuets = new int[9];
        targuets[0] = p1;targuets[1] = p2;targuets[2] = p3;
        targuets[3] = p4;targuets[4] = p5;targuets[5] = p6;
        targuets[6] = p7;targuets[7] = p8;targuets[8] = p9;
        
        return targuets;
    }
}