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

public class Solution {

    private static int[][] magicSquares = {
            {8,1,6,3,5,7,4,9,2},
            {6,7,2,1,5,9,8,3,4},
            {2,9,4,7,5,3,6,1,8},
            {4,3,8,9,5,1,2,7,6},
            {6,1,8,7,5,3,2,9,4},
            {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}
    };

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int square[] = new int[9];
        for(int i = 0; i < 9; i++)
            square[i] = in.nextInt();

        int minDifference = 10000;
        for(int j = 0; j < magicSquares.length; j++){
            int difference = 0;
            for(int i = 0; i < 9; i++)
                difference += Math.abs(magicSquares[j][i] - square[i]);
            minDifference = Math.min(minDifference, difference);
        }

        System.out.println(minDifference);
    }
}