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) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        Scanner in = new Scanner(System.in);
        int[] a = new int[3];
        int[] b = new int[3];
        int[] c = new int[3];
        
        int[][] all = new int[3][3];
        
        for (int a_i = 0; a_i < 3; a_i++) {
            a[a_i] = in.nextInt();
            all[0][a_i] = a[a_i];
        }
        for (int b_i = 0; b_i < 3; b_i++) {
            b[b_i] = in.nextInt();
            all[1][b_i] = b[b_i];
        }
        for (int c_i = 0; c_i < 3; c_i++) {
            c[c_i] = in.nextInt();
            all[2][c_i] = c[c_i];
        }
        
        if (all[0][0] + all[0][1] + all[0][2] == 3 * all[1][1] &&
            all[1][0] + all[1][1] + all[1][2] == 3 * all[1][1] &&
            all[2][0] + all[2][1] + all[2][2] == 3 * all[1][1] &&
            all[0][0] + all[1][0] + all[2][0] == 3 * all[1][1] &&
            all[0][1] + all[1][1] + all[2][1] == 3 * all[1][1] &&
            all[0][2] + all[1][2] + all[2][2] == 3 * all[1][1] &&
            all[0][0] + all[1][1] + all[2][2] == 3 * all[1][1] &&
            all[0][2] + all[1][1] + all[2][0] == 3 * all[1][1]) {
            System.out.println("0");
        } else {
            int[] cost = new int[8];
            
            cost[0] = Math.abs(all[0][0] - 8) + Math.abs(all[0][1] - 1) + Math.abs(all[0][2] - 6) +
                     Math.abs(all[1][0] - 3) + Math.abs(all[1][1] - 5) + Math.abs(all[1][2] - 7) +
                     Math.abs(all[2][0] - 4) + Math.abs(all[2][1] - 9) + Math.abs(all[2][2] - 2);
            
            cost[1] = Math.abs(all[0][0] - 4) + Math.abs(all[0][1] - 3) + Math.abs(all[0][2] - 8) +
                     Math.abs(all[1][0] - 9) + Math.abs(all[1][1] - 5) + Math.abs(all[1][2] - 1) +
                     Math.abs(all[2][0] - 2) + Math.abs(all[2][1] - 7) + Math.abs(all[2][2] - 6);
            
            cost[2] = Math.abs(all[0][0] - 2) + Math.abs(all[0][1] - 9) + Math.abs(all[0][2] - 4) +
                     Math.abs(all[1][0] - 7) + Math.abs(all[1][1] - 5) + Math.abs(all[1][2] - 3) +
                     Math.abs(all[2][0] - 6) + Math.abs(all[2][1] - 1) + Math.abs(all[2][2] - 8);
            
            cost[3] = Math.abs(all[0][0] - 6) + Math.abs(all[0][1] - 7) + Math.abs(all[0][2] - 2) +
                     Math.abs(all[1][0] - 1) + Math.abs(all[1][1] - 5) + Math.abs(all[1][2] - 9) +
                     Math.abs(all[2][0] - 8) + Math.abs(all[2][1] - 3) + Math.abs(all[2][2] - 4);
            
            cost[4] = Math.abs(all[0][0] - 6) + Math.abs(all[0][1] - 1) + Math.abs(all[0][2] - 8) +
                     Math.abs(all[1][0] - 7) + Math.abs(all[1][1] - 5) + Math.abs(all[1][2] - 3) +
                     Math.abs(all[2][0] - 2) + Math.abs(all[2][1] - 9) + Math.abs(all[2][2] - 4);
            
            cost[5] = Math.abs(all[0][0] - 8) + Math.abs(all[0][1] - 3) + Math.abs(all[0][2] - 4) +
                     Math.abs(all[1][0] - 1) + Math.abs(all[1][1] - 5) + Math.abs(all[1][2] - 9) +
                     Math.abs(all[2][0] - 6) + Math.abs(all[2][1] - 7) + Math.abs(all[2][2] - 2);
            
            cost[6] = Math.abs(all[0][0] - 4) + Math.abs(all[0][1] - 9) + Math.abs(all[0][2] - 2) +
                     Math.abs(all[1][0] - 3) + Math.abs(all[1][1] - 5) + Math.abs(all[1][2] - 7) +
                     Math.abs(all[2][0] - 8) + Math.abs(all[2][1] - 1) + Math.abs(all[2][2] - 6);
            
            cost[7] = Math.abs(all[0][0] - 2) + Math.abs(all[0][1] - 7) + Math.abs(all[0][2] - 6) +
                     Math.abs(all[1][0] - 9) + Math.abs(all[1][1] - 5) + Math.abs(all[1][2] - 1) +
                     Math.abs(all[2][0] - 4) + Math.abs(all[2][1] - 3) + Math.abs(all[2][2] - 8);
            
            int lowest = cost[0];
            for (int current : cost) {
                if (current < lowest) {
                    lowest = current;
                }
            }
            
            System.out.println(lowest);
            
        }
        
        
     }
}