import java.io.*;
import java.util.*;
import static java.lang.Math.abs;

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 in = new Scanner(System.in);
            int[][] magic_matrix = new int[3][3];
            int a,b;

            for(int i =0;i<3;i++) {
                for(int j=0;j<3;j++) {
                    magic_matrix[i][j] = in.nextInt();
                }

            }
            int[][][] magic = {{{8,1,6},{3,5,7},{4,9,2}},{{4,3,8},{9,5,1},{2,7,6}},{{2,9,4},{7,5,3},{6,1,8}},{{6,7,2},{1,5,9},{8,3,4}},{{6,1,8},{7,5,3},{2,9,4}}
                    ,{{8,3,4},{1,5,9},{6,7,2}},{{4,9,2},{3,5,7},{8,1,6}},{{2,7,6},{9,5,1},{4,3,8}}};


            int minimum = Integer.MAX_VALUE;

            for (int k =0;k<8;k++) {
                int difference = 0;
                for (int i =0;i<3;i++) {
                    for(int j =0;j<3;j++) {
                        int absolute = abs(magic[k][i][j] - magic_matrix[i][j]);
                        difference = difference + absolute;
                    }
                }
                if (difference < minimum) {
                    minimum = difference;
                }
            }

            System.out.println(minimum);


    }
}