import java.io.*;
import java.util.*;

public class Solution {

   public static void main(String[] args)
  {
    /*
     * Enter your code here. Read input from STDIN. Print output to STDOUT. Your
     * class should be named Solution.
     */
    Scanner in = new Scanner(System.in);
    String row1 = in.nextLine();
    String row2 = in.nextLine();
    String row3 = in.nextLine();
    
    int[][] m1 = new int[][]{{4,9,2}, 
                             {3,5,7}, 
                             {8,1,6}};
    int[][] m2 = new int[][]{{2,9,4}, 
                             {7,5,3}, 
                             {6,1,8}};
                             
    int[][] m3 = new int[][]{{4,3,8}, 
                             {9,5,1}, 
                             {2,7,6}};
    int[][] m4 = new int[][]{{2,7,6}, 
                             {9,5,1}, 
                             {4,3,8}};
                             
    int[][] m5 = new int[][]{{8,1,6}, 
                             {3,5,7}, 
                             {4,9,2}};
    int[][] m6 = new int[][]{{6,1,8}, 
                             {7,5,3}, 
                             {2,9,4}};
                             
    int[][] m7 = new int[][]{{8,3,4}, 
                             {1,5,9}, 
                             {6,7,2}};
                             
    int[][] m8 = new int[][]{{6,7,2}, 
                             {1,5,9}, 
                             {8,3,4}};
    
    int[][][] listOfMatrix = new int[][][]{m1, m2, m3, m4, m5, m6, m7, m8};
                             
    // Given matrix
    int[][] m = new int[3][3];
    String[] row1arr = row1.split(" ");
    String[] row2arr = row2.split(" ");
    String[] row3arr = row3.split(" ");
    
    for ( int i = 0; i < row1arr.length; i ++ )
    {
      m[0][i] = Integer.parseInt(row1arr[i]);
    }
    
    for ( int i = 0; i < row2arr.length; i ++ )
    {
      m[1][i] = Integer.parseInt(row2arr[i]);
    }
    
    for ( int i = 0; i < row3arr.length; i ++ )
    {
      m[2][i] = Integer.parseInt(row3arr[i]);
    }
    
    int min = Integer.MAX_VALUE;
    
    for ( int[][] i : listOfMatrix)
    {
      int diff = findDiff(i, m);
      if ( diff < min) min = diff;
    }
    
    System.out.println(min);
  }
  
  private static int findDiff(int[][] m1, int[][] m2)
  {
    int diff = 0;
    for ( int i = 0; i < 3; i ++ )
    {
      for ( int j = 0; j < 3; j++ )
      {
        diff += Math.abs(m1[i][j]-m2[i][j]);
      }
    }
    return diff;
  }
}