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

public class Solution {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int mat[][] = new int[3][3];
        int sols[][][] = new int[][][]{
            {   {2,7,6},
                {9,5,1},
                {4,3,8}},
                
            {   {6,7,2},
                {1,5,9},
                {8,3,4}},
                
            {   {6,1,8},
                {7,5,3},
                {2,9,4}},
                
            {   {8,1,6},
                {3,5,7},
                {4,9,2}},
                
            {   {8,3,4},
                {1,5,9},
                {6,7,2}},
                
            {   {4,3,8},
                {9,5,1},
                {2,7,6}},
                
            {   {4,9,2},
                {3,5,7},
                {8,1,6}},
                
            {   {2,9,4},
                {7,5,3},
                {6,1,8}}};
        int sums[] = {0,0,0,0,0,0,0,0};
        for(int i = 0; i<3; i++)
            {
                for(int j = 0; j<3;j++)
                    {
                        int cn = scan.nextInt();
                        mat[i][j] = cn;
                        for(int  k =0; k<8;k++)
                        {
                            sums[k] =sums[k] + Math.abs(cn - sols[k][i][j]);
                    }
        }
    }
        int min = sums[0];
        for(int i = 0; i<8;i++)
            {
                if(min>sums[i])
                    {
                        min = sums[i];
                }
        }
        System.out.println(min);
        
        
}
}