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

public class Solution {

    static ArrayList<Integer> costArray = new ArrayList<Integer>();    
    
    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 scan = new Scanner(System.in);
        
        int[][] arr = new int[3][3];
        
        for(int i = 0; i< 3; i++)
        {
            for(int j = 0; j < 3; j++)
            {
                arr[i][j] = scan.nextInt();                
            }                
        }
        
        int[][] msquare1 = {
                            {8,1,6},
                            {3,5,7},
                            {4,9,2}
                           };
        int[][] msquare2 = {
                                {4,3,8},
                                {9,5,1},
                                {2,7,6}            
                           };
        int[][] msquare3 = {
                                {2,9,4},
                                {7,5,3},
                                {6,1,8}            
                           };
        int[][] msquare4 = {
                                {6,7,2},
                                {1,5,9},
                                {8,3,4}            
                           };
        int[][] msquare5 = {
                                {6,1,8},
                                {7,5,3},
                                {2,9,4}                
                            };
        int[][] msquare6 = {
                                {8,3,4},
                                {1,5,9},
                                {6,7,2}            
                           };
        int[][] msquare7 = {
                                {4,9,2},
                                {3,5,7},
                                {8,1,6}            
                           };
        int[][] msquare8 = {
                                {2,7,6},
                                {9,5,1},
                                {4,3,8}    
                           };
        
                
        calculateMinCost(arr,msquare1);
        calculateMinCost(arr,msquare2);
        calculateMinCost(arr,msquare3);
        calculateMinCost(arr,msquare4);
        calculateMinCost(arr,msquare5);
        calculateMinCost(arr,msquare6);
        calculateMinCost(arr,msquare7);
        calculateMinCost(arr,msquare8);
        
        Collections.sort(costArray);
        System.out.println(costArray.get(0));
                              
    }
    
    static void calculateMinCost(int[][] arr, int[][] msquare)
    {
       
        int len = arr.length;
        int cost = 0;
        
        for(int i = 0; i < len; i++)
        {
            for(int j = 0; j < len; j++)
            {
                if(arr[i][j] != msquare[i][j])
                {
                    cost = cost + Math.abs(arr[i][j] - msquare[i][j]);                    
                }                    
                
            }                
        }
        costArray.add(cost);
        
        
        
    }        
    
    
}