import java.io.*;
import java.util.*;

public class Solution {

    public static void main(String[] args) {
      Scanner kb = new Scanner(System.in);
       int arr[][] = new int[3][3];
       int tst[][][] = new int[8][3][3];
       for(int i = 0;i < 3;i++){
           for(int j = 0;j < 3;j++){
               arr[i][j] = kb.nextInt();
           }
       }
       tst[0][0][0] = 8;
       tst[0][0][1] = 1;
       tst[0][0][2] = 6;
       tst[0][1][0] = 3;
       tst[0][1][1] = 5;
       tst[0][1][2] = 7;
       tst[0][2][0] = 4;
       tst[0][2][1] = 9;
       tst[0][2][2] = 2;
       
       tst[1][0][0] = 4;
       tst[1][0][1] = 3;
       tst[1][0][2] = 8;
       tst[1][1][0] = 9;
       tst[1][1][1] = 5;
       tst[1][1][2] = 1;
       tst[1][2][0] = 2;
       tst[1][2][1] = 7;
       tst[1][2][2] = 6;
        
       tst[2][0][0] = 2;
       tst[2][0][1] = 7;
       tst[2][0][2] = 6;
       tst[2][1][0] = 9;
       tst[2][1][1] = 5;
       tst[2][1][2] = 1;
       tst[2][2][0] = 4;
       tst[2][2][1] = 3;
       tst[2][2][2] = 8;
        
       tst[3][0][0] = 2;
       tst[3][0][1] = 9;
       tst[3][0][2] = 4;
       tst[3][1][0] = 7;
       tst[3][1][1] = 5;
       tst[3][1][2] = 3;
       tst[3][2][0] = 6;
       tst[3][2][1] = 1;
       tst[3][2][2] = 8;
        
       tst[4][0][0] = 6;
       tst[4][0][1] = 7;
       tst[4][0][2] = 2;
       tst[4][1][0] = 1;
       tst[4][1][1] = 5;
       tst[4][1][2] = 9;
       tst[4][2][0] = 8;
       tst[4][2][1] = 3;
       tst[4][2][2] = 4;
        
       tst[5][0][0] = 4;
       tst[5][0][1] = 9;
       tst[5][0][2] = 2;
       tst[5][1][0] = 3;
       tst[5][1][1] = 5;
       tst[5][1][2] = 7;
       tst[5][2][0] = 8;
       tst[5][2][1] = 1;
       tst[5][2][2] = 6;
        
       tst[6][0][0] = 6;
       tst[6][0][1] = 1;
       tst[6][0][2] = 8;
       tst[6][1][0] = 7;
       tst[6][1][1] = 5;
       tst[6][1][2] = 3;
       tst[6][2][0] = 2;
       tst[6][2][1] = 9;
       tst[6][2][2] = 4;
        
       tst[7][0][0] = 8;
       tst[7][0][1] = 3;
       tst[7][0][2] = 4;
       tst[7][1][0] = 1;
       tst[7][1][1] = 5;
       tst[7][1][2] = 9;
       tst[7][2][0] = 6;
       tst[7][2][1] = 7;
       tst[7][2][2] = 2;
        
       int min = 9999;
       for(int i = 0;i < 8;i++){
           int tmp = 0;
           for(int j = 0;j < 3;j++){
               for(int k = 0;k < 3;k++){
                   tmp += Math.abs(arr[j][k] - tst[i][j][k]);
               }
           }
           if(tmp < min){
               min = tmp;
           }
       }
        System.out.println(min);
    }
}