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][3];
        int arr1[][] = {{8,1,6},{3,5,7},{4,9,2}};
        int arr2[][] = {{4,3,8},{9,5,1},{2,7,6}};
        int arr3[][] = {{2,9,4},{7,5,3},{6,1,8}};
        int arr4[][] = {{6,7,2},{1,5,9},{8,3,4}};
        int arr5[][] = {{6,1,8},{7,5,3},{2,9,4}};
        int arr6[][] = {{8,3,4},{1,5,9},{6,7,2}};
        int arr7[][] = {{4,9,2},{3,5,7},{8,1,6}};
        int arr8[][] = {{2,7,6},{9,5,1},{4,3,8}};
        ArrayList<Integer> result = new ArrayList<Integer>();    
        for (int i = 0; i < 8; i++) {
            result.add(0);
            }
        int sum1 = 0, sum2 = 0, sum3 = 0, sum4 = 0, sum5 = 0, sum6 = 0, sum7 = 0, sum8 = 0;
        for(int a_i=0; a_i < 3; a_i++){
            for(int a_j=0; a_j < 3; a_j++){
                int num = in.nextInt();
                if (num != arr1[a_i][a_j]) {
                    sum1 += Math.abs(num - arr1[a_i][a_j]); 
                    result.set(0,sum1);
                }
                if (num != arr2[a_i][a_j]){
                    sum2 += Math.abs(num - arr2[a_i][a_j]);
                    result.set(1,sum2);
                }
                if (num != arr3[a_i][a_j]){
                    sum3 += Math.abs(num - arr3[a_i][a_j]);
                   result.set(2,sum3); 
                }
                if (num != arr4[a_i][a_j]) {
                    sum4 += Math.abs(num - arr4[a_i][a_j]);
                    result.set(3,sum4);
                }
                if (num != arr5[a_i][a_j]){
                    sum5 += Math.abs(num - arr5[a_i][a_j]);
                    result.set(4,sum5);
                }
                if (num != arr6[a_i][a_j]) {
                    sum6 += Math.abs(num - arr6[a_i][a_j]);
                    result.set(5,sum6);
                }
                if (num != arr7[a_i][a_j]) {
                    sum7 += Math.abs(num - arr7[a_i][a_j]);
                    result.set(6,sum7);  
                }
                if (num != arr8[a_i][a_j]) {
                    sum8 += Math.abs(num - arr8[a_i][a_j]);
                  result.set(7,sum8);
                }   
            }
        }

        Collections.sort(result);
        System.out.println(result.get(0));   
    }
}