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) {
        Scanner in = new Scanner(System.in);
        int m[][] = new int[3][3];
        for (int r=0; r<3; r++) {
            for (int c=0; c<3; c++) {
                m[r][c] = in.nextInt();
            }
        }
        
        int cost = 9999999;

        int m1[][][] = 
        {{{2,7,6}
          ,{9,5,1}
          ,{4,3,8}},
        {{4,9,2}
         ,{3,5,7}
         ,{8,1,6}},
        {{8,3,4}
         ,{1,5,9}
         ,{6,7,2}},
        {{6,1,8}
         ,{7,5,3}
         ,{2,9,4}},
        {{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}},
        {{2,9,4}
         ,{7,5,3}
         ,{6,1,8}}};
        
        for (int m_i = 0; m_i < 8; m_i++) {
            int curCost = compare(m,m1[m_i]);
            if (curCost<cost) cost = curCost;
        }
        
        System.out.println(cost);
        
    }
    
    public static int compare(int[][] a, int[][] b) {
        int cost = 0;
        for (int r=0; r<3; r++) {
            for (int c=0; c<3; c++) {
                cost += Math.abs(a[r][c] - b[r][c]);
            }
        }
        return cost;
    }
}