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

class compute{
   
    int[] sum={0,0,0,0,0,0,0,0};
    int x=0;
    void calculate(int[][] a,int[][] b){
        
    
    int temp=0;
        int i,j,k;
        
        for(i=0;i<3;i++)
            for(j=0;j<3;j++){
                if(a[i][j]!=b[i][j]){
                    //continue;
                //else{
                    if(a[i][j]>b[i][j])
                        temp+=a[i][j]-b[i][j];
                    else
                        temp+=b[i][j]-a[i][j];
                }
            
            }
        sum[x++]=temp;
        }
    int calculateMin(){
        int min;
        int i;
        min=sum[0];    
        for(i=1;i<8;i++){
                if(min>sum[i])
                    min=sum[i];
            }
        //for(i=0;i<8;i++)
       //     {
          //      System.out.println(sum[i]);
       // }
        return min;
                
    }
}
public class Solution {
    
  /*  void calculate(int[][] a,int[][] b){
        
        int i,j,k;
        
        for(i=0;i<3;i++)
            for(j=0;j<3;j++){
                if(a[i][j]==b[i][j])
                    continue;
                else{
                    if(a[i][j]>b[i][j])
                        temp=a[i][j]-b[i][j];
                    else
                        temp=b[i][j]-a[i][j];
                }
            
            }
        sum[x++]=temp;
        }

    */
    public static void main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        compute ob = new compute();
        int[][] arr1 = {{4,9,2},{3,5,7},{8,1,6}} ;
        int[][] arr2 = {{4,3,8},{9,5,1,},{2,7,6}};
        int[][] arr3 = {{8,1,6},{3,5,7},{4,9,2}};
        int[][] arr4 = {{8,3,4},{1,5,9},{6,7,2}};
        int[][] arr5 = {{6,1,8},{7,5,3},{2,9,4}};
        int[][] arr6 = {{2,9,4},{7,5,3},{6,1,8}};
        int[][] arr7 = {{6,7,2},{1,5,9},{8,3,4}};
        int[][] arr8 = {{2,7,6},{9,5,1},{4,3,8}};
        int[] sum=new int[8];
        int max,i,j;
        //int[][] dummy={{1,2,3},{4,5,6},{7,8,9}};
        int [][] array = new int[3][3]; 
        int ans;
        Scanner s = new Scanner (System.in);
        for(i=0;i<3;i++)
            for(j=0;j<3;j++)
                array[i][j] = s.nextInt();
        
            ob.calculate(array,arr1);
            ob.calculate(array,arr2);
            ob.calculate(array,arr3);
            ob.calculate(array,arr4);
            ob.calculate(array,arr5);
            ob.calculate(array,arr6);
            ob.calculate(array,arr7);
            ob.calculate(array,arr8);
            
        ans = ob.calculateMin();
        System.out.println(ans);
    }
}