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

public class Solution {

    public static void main(String args[]){
        int [][][] magicSqr = {
            {{4,9,2}, {3,5,7}, {8,1,6}},
            {{2,7,6}, {9,5,1}, {4,3,8}},
            {{6,1,8}, {7,5,3}, {2,9,4}},
            {{8,3,4}, {1,5,9}, {6,7,2}},
            
            {{2,9,4}, {7,5,3}, {6,1,8}},
            {{4,3,8}, {9,5,1}, {2,7,6}},
            {{8,1,6}, {3,5,7}, {4,9,2}},
            {{6,7,2}, {1,5,9}, {8,3,4}},
        };
        
        Scanner s = new Scanner(System.in);
        int [][]curr = new int[3][3];
        for(int r = 0; r < 3; r++){
            for(int c = 0; c < 3; c++){
                curr[r][c] = s.nextInt();
            }
        }//end for
        
        int min = Integer.MAX_VALUE;
        int curDist = 0;
        for(int i = 0; i < 8; i++){
            int[][] msqr = magicSqr[i];
            curDist = 0;
            for(int r = 0; r < 3; r++){
                for(int c = 0; c < 3; c++){
                    curDist += Math.abs(curr[r][c] - msqr[r][c]);
                }
            }
            if(curDist < min){
                min = curDist;
            }//end if
        }//end for
        
        System.out.println(min);
    }//end of main
}