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 in = new Scanner(System.in);
        int[][] square = new int[3][3];
        for(int i = 0; i < 3; i++){
            for(int j = 0; j< 3; j++){
                square[i][j] = in.nextInt();
                //System.out.print(square[i][j] + " ");
            }
            if(in.hasNextLine()){
                in.nextLine();
            }
            //System.out.println();
        }
        int change = 0;
        int [][][] magicSquares = {{{8,1,6},{3,5,7},{4,9,2}},
                                   {{6,1,8},{7,5,3},{2,9,4}},
                                   {{4,9,2},{3,5,7},{8,1,6}},
                                   {{2,9,4},{7,5,3},{6,1,8}},
                                   {{8,3,4},{1,5,9},{6,7,2}},
                                   {{4,3,8},{9,5,1},{2,7,6}},
                                   {{6,7,2},{1,5,9},{8,3,4}},
                                   {{2,7,6},{9,5,1},{4,3,8}}};
       int min = 10000;
        
        for(int i = 0; i < 8; i++){
            
            int dif = 0;
            for(int j = 0; j < 3; j++){
                for(int k = 0; k< 3; k++){
                    dif += (Math.abs(square[j][k] - magicSquares[i][j][k]));
                }
            }
            if(dif < min){
                min = dif;
            }
        }
        System.out.println(min);
    }
}