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

public class Solution {

    public static void main(String[] args) {
        int[][] magicSquares = {
                        {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},
                        {6, 7, 2,
                                        1, 5, 9,
                                        8, 3, 4},
                        {6, 1, 8,
                                        7, 5, 3,
                                        2, 9, 4},
                        {8, 3, 4,
                                        1, 5, 9,
                                        6, 7, 2},
                        {4, 9, 2,
                                        3, 5, 7,
                                        8, 1, 6},
                        {2, 7, 6,
                                        9, 5, 1,
                                        4, 3, 8}};
        Scanner s = new Scanner(System.in);
        int[] square = new int[9];
        for (int i = 0; i < 9; i++)
            square[i] = s.nextInt();
        int min = 100000;
        for (int[] magic : magicSquares) {
            int dist = 0;
            for (int i = 0; i < 9; i++)
                dist += Math.abs(square[i] - magic[i]);
            if (dist < min)
                min = dist;
        }
        System.out.println(min);
    }
}