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

public class Solution {
    
    public static int calculateDiff(int[][]a, int[][]b){
        int diff = 0;
        for(int i=0; i<3; i++){
            for(int j=0; j<3; j++){
                if(a[i][j]-b[i][j]<0){
                    diff = diff + b[i][j]-a[i][j];
                }
                else{
                    diff = diff + a[i][j]-b[i][j];
                }
            }
        }
        return diff;
    }
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int[][] a = new int[3][3];
        for(int i=0; i<3; i++){
            for(int j=0; j<3; j++){
                a[i][j] = sc.nextInt();
            }
        }
        
        
        int[][] ms1 = {{2,7,6},{9,5,1},{4,3,8}};
        int[][] ms2 = {{6,7,2},{1,5,9},{8,3,4}};
        int[][] ms3 = {{4,9,2},{3,5,7},{8,1,6}};
        int[][] ms4 = {{2,9,4},{7,5,3},{6,1,8}};
        int[][] ms5 = {{8,3,4},{1,5,9},{6,7,2}};
        int[][] ms6 = {{4,3,8},{9,5,1},{2,7,6}};
        int[][] ms7 = {{6,1,8},{7,5,3},{2,9,4}};
        int[][] ms8 = {{8,1,6},{3,5,7},{4,9,2}};
        
        int min = Integer.MAX_VALUE;
        int diff = calculateDiff(a,ms1);
        if(diff<min){
            min =diff;
        }
        diff = calculateDiff(a,ms2);
        if(diff<min){
            min =diff;
        }
        diff = calculateDiff(a,ms3);
        if(diff<min){
            min =diff;
        }
        diff = calculateDiff(a,ms4);
        if(diff<min){
            min =diff;
        }
        diff = calculateDiff(a,ms5);
        if(diff<min){
            min =diff;
        }
        diff = calculateDiff(a,ms6);
        if(diff<min){
            min =diff;
        }
        diff = calculateDiff(a,ms7);
        if(diff<min){
            min =diff;
        }
        diff = calculateDiff(a,ms8);
        if(diff<min){
            min =diff;
        }
        System.out.println(min);
        
    }
}