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

public class Solution {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int [][]inputSquare = new int [3][3];
        for (int i=0;i<3;i++){
            for (int j=0;j<3;j++){
                inputSquare[i][j]=scanner.nextInt();
            }
        }
        int [][]square1={{8,1,6},{3,5,7},{4,9,2}};
        int [][]square2={{6,1,8},{7,5,3},{2,9,4}};
        int [][]square3={{8,3,4},{1,5,9},{6,7,2}};
        int [][]square4={{6,7,2},{1,5,9},{8,3,4}};
        int [][]square5={{4,9,2},{3,5,7},{8,1,6}};
        int [][]square6={{2,9,4},{7,5,3},{6,1,8}};
        int [][]square7={{2,7,6},{9,5,1},{4,3,8}};
        int [][]square8={{4,3,8},{9,5,1},{2,7,6}};
        int []diff=new int [8];
        for (int i=0;i<3;i++){
            for (int j=0;j<3;j++){
                diff[0]+=Math.abs(square1[i][j]-inputSquare[i][j]);
                diff[1]+=Math.abs(square2[i][j]-inputSquare[i][j]);
                diff[2]+=Math.abs(square3[i][j]-inputSquare[i][j]);
                diff[3]+=Math.abs(square4[i][j]-inputSquare[i][j]);
                diff[4]+=Math.abs(square5[i][j]-inputSquare[i][j]);
                diff[5]+=Math.abs(square6[i][j]-inputSquare[i][j]);
                diff[6]+=Math.abs(square7[i][j]-inputSquare[i][j]);
                diff[7]+=Math.abs(square8[i][j]-inputSquare[i][j]);
            }
        }
        int min=diff[0];
        for (int i=1;i<8;i++){
            if(diff[i]<min){
                min=diff[i];
            }
        }
        System.out.println(min);
    }
}