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[] m = new int[9];

        for (int i=0;i<9;i++) {
              m[i] = in.nextInt();
        }
        int[][] magicSquares = {
          {4,9,2,3,5,7,8,1,6},
          {2,7,6,9,5,1,4,3,8},
          {6,1,8,7,5,3,2,9,4},
          {8,3,4,1,5,9,6,7,2},
          {2,9,4,7,5,3,6,1,8},
          {6,7,2,1,5,9,8,3,4},
          {8,1,6,3,5,7,4,9,2},
          {4,3,8,9,5,1,2,7,6}
        };
        
        int cost = 0;
        int tmpCost = 100;

        for (int i=0;i<8;i++) {
          int tmp = 0;
          for (int j=0;j<9;j++) {
            tmp+=Math.abs(magicSquares[i][j]-m[j]);
          }
          if (tmp == 0) {
            tmpCost = 0;
            break;
          }
          if (tmp<tmpCost) {
            tmpCost = tmp;
          }  



        }
        cost = tmpCost;
        System.out.println(cost);
        }
}