import java.io.*;
import java.util.*;
import java.lang.Math;

public class Solution {
    
    public static void main(String[] args) {
        int[][] magicSquares = {
            {8,1,6,3,5,7,4,9,2},
            {6,1,8,7,5,3,2,9,4},
            {8,3,4,1,5,9,6,7,2},
            {4,3,8,9,5,1,2,7,6},
            {6,7,2,1,5,9,8,3,4},
            {2,7,6,9,5,1,4,3,8},
            {4,9,2,3,5,7,8,1,6},
            {2,9,4,7,5,3,6,1,8}
        };
        
        
        Scanner sc = new Scanner(System.in);
        int[] array = new int[9];
        for(int i = 0; i < 9; i++)
            array[i] = sc.nextInt();
        
        int min = 9999;
        for(int i = 0; i < magicSquares.length; i++) {
            int arrayDiff = arrayDiff(magicSquares[i], array, 9);
            if(arrayDiff == 0) {
                min = 0;
                break;
            }
                
            if(min > arrayDiff)
                min = arrayDiff;
        }
        System.out.println(min);
        
        
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
    }
    
    public static int arrayDiff(int[] a1, int [] a2, int l) {
        int diff = 0;
        for(int i = 0; i < l; i++) {
            diff += Math.abs(a1[i] - a2[i]);
        }
        //System.out.println(diff);
        return diff;
    }
}