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];
        for(int i = 0; i < 3; i++){
            for (int j = 0; j < 3; j++){
                mat[i][j] = scan.nextInt();    
            }
        }
        
       int[][] magic1 = {{4, 9, 2}, {3 ,5, 7}, {8, 1, 6}};
       int[][] magic2 = {{2, 7, 6}, {9 ,5, 1}, {4, 3, 8}};
       int[][] magic3 = {{6, 1, 8}, {7 ,5, 3}, {2, 9, 4}};
       int[][] magic4 = {{8, 3, 4}, {1 ,5, 9}, {6, 7, 2}};
       
       int[][] magic5 = {{8, 1, 6}, {3 ,5, 7}, {4, 9, 2}};
       int[][] magic6 = {{2, 9, 4}, {7 ,5, 3}, {6, 1, 8}};
       int[][] magic7 = {{4, 3, 8}, {9 ,5, 1}, {2, 7, 6}};
       int[][] magic8 = {{6, 7, 2}, {1 ,5, 9}, {8, 3, 4}};
       
       int dif1 = howDif(mat, magic1);
       int dif2 = howDif(mat, magic2);
       int dif3 = howDif(mat, magic3);
       int dif4 = howDif(mat, magic4);
        int dif5 = howDif(mat, magic5);
       int dif6 = howDif(mat, magic6);
       int dif7 = howDif(mat, magic7);
       int dif8 = howDif(mat, magic8);
              
       int leastDif = dif1;
        if(dif2 < leastDif)
            leastDif = dif2;
        if(dif3 < leastDif)
            leastDif = dif3;
        if(dif4 < leastDif)
            leastDif = dif4;
        if(dif5 < leastDif)
            leastDif = dif5;
        if(dif6 < leastDif)
            leastDif = dif6;
        if(dif7 < leastDif)
            leastDif = dif7;
        
        if(dif8 < leastDif)
            leastDif = dif8;
        System.out.println(leastDif);
    }
    
    
    static int howDif(int mat[][], int magic[][]) {
       int dif = 0;
        for (int i = 0; i < 3; i ++){
            for(int j = 0; j < 3; j++){
                dif += Math.abs(mat[i][j] - magic[i][j]);
            }
        }
        return dif;        
    }
}