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) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        
        Scanner sc = new Scanner(System.in);
        ArrayList<int[][]> l = new ArrayList<>();
        int[][] magic1 = {
            {4, 9, 2}, 
            {3, 5, 7},
            {8, 1, 6}
        };
        l.add(magic1);
        
        int[][] magic2 = {
            {8, 3, 4}, 
            {1, 5, 9},
            {6, 7, 2}
        };
        l.add(magic2);
        
        int[][] magic3 = {
            {8, 1, 6}, 
            {3, 5, 7},
            {4, 9, 2}
        };
        l.add(magic3);
        
        int[][] magic4 = {
            {6, 7, 2}, 
            {1, 5, 9},
            {8, 3, 4}
        };
        l.add(magic4);
        
        for(int k=0;k<4;k++){
            int[][] mtr = l.get(k);
            int[][] new_m = new int[3][3];
            for(int i=0;i<3;i++){
                for(int j=0;j<3;j++){
                    new_m[i][j] = mtr[i][2-j];
                }
            }
            l.add(new_m);
        }
        
        int[][] m = new int[3][3];
        int min = Integer.MAX_VALUE;
        for (int i = 0; i < 3; i++) {
            for (int j = 0; j < 3; j++) {
                m[i][j] = sc.nextInt();
            }
        }
        
        for (int k = 0; k < l.size(); k++) {
            int dif = 0;
            int[][] magic = l.get(k);
            for (int i = 0; i < 3; i++) {
                for (int j = 0; j < 3; j++) {
                    dif += Math.abs(m[i][j] - magic[i][j]);
                }
            }
            if (min > dif) {
                min = dif;
            }
       }
        
       System.out.println(min);


    }
}