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

public class Solution {
    
    static int[][] s1 = {{8,1,6},
                  {3,5,7},
                  {4,9,2}};
    static int[][] s2 = {{4,3,8},
                  {9,5,1},
                  {2,7,6}};
    static int[][] s3 = {{2,9,4},
                  {7,5,3},
                  {6,1,8}};
    static int[][] s4 = {{6,7,2},
                  {1,5,9},
                  {8,3,4}};
    static int[][] s5 = {{6,1,8},
                  {7,5,3},
                  {2,9,4}};
    static int[][] s6 = {{8,3,4},
                  {1,5,9},
                  {6,7,2}};
    static int[][] s7 = {{4,9,2},
                  {3,5,7},
                  {8,1,6}};
    static int[][] s8 = {{2,7,6},
                  {9,5,1},
                  {4,3,8}};
    static int[][][] magicSquares = {s1,s2,s3,s4,s5,s6,s7,s8};
    
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int[][] matrix = new int[3][3];
        for(int x = 0; x < 3; x++) {
            for(int y = 0; y < 3; y++) {
                matrix[x][y] = scan.nextInt();
            }
        }
        int cost = Arrays.asList(magicSquares).stream().mapToInt(s -> distance(matrix, s)).min().getAsInt();
        System.out.println(cost);
    }
    
    static int distance(int[][] first, int[][] second) {
        int distance = 0;
        for(int x = 0; x < 3; x++) {
            for(int y = 0; y < 3; y++) {
                distance += Math.abs(first[x][y] - second[x][y]);
            }
        }
        return distance;
    }
}