import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

 public static int compare(int ar[][],int br[][]){
        int i,j;int sum=0;
        int z;
        for(i=0;i<3;i++){
            for(j=0;j<3;j++){
                z=ar[i][j]-br[i][j];
               if(z>0)
                   sum=sum+z;
               else
                   sum=sum-z;
            }
        }
   return sum; }
    

    public static void main(String[] args) 
    {
        int i,j;
    int a[][]={{8,1,6},{3,5,7},{4,9,2}};
    int b[][]={{6,1,8},{7,5,3},{2,9,4}};
    int c[][]={{4,3,8},{9,5,1},{2,7,6}};
    int d[][]={{2,7,6},{9,5,1},{4,3,8}};
    int e[][]={{2,9,4},{7,5,3},{6,1,8}};
    int f[][]={{4,9,2},{3,5,7},{8,1,6}};
    int g[][]={{6,7,2},{1,5,9},{8,3,4}};
    int h[][]={{8,3,4},{1,5,9},{6,7,2}};
    int[] maxi=new int[9];
   // int mxm=0;
    
    
        Scanner in = new Scanner(System.in);
       int[][] x=new int[3][3];
       for(i=0;i<3;i++)
       {
           for(j=0;j<3;j++)
           {
              x[i][j]=in.nextInt();
           }
       }
       maxi[0]=compare(x,a);
       maxi[1]=compare(x,b);
       maxi[2]=compare(x,c);
       maxi[3]=compare(x,d);
       maxi[4]=compare(x,e);
       maxi[5]=compare(x,f);
       maxi[6]=compare(x,g);
       maxi[7]=compare(x,h);
        int least=maxi[0];
       for(i=1;i<8;i++){
           if(least>maxi[i]){
               least=maxi[i];
           }
     
       }
       System.out.print(least); }
}