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) {
        Scanner in=new Scanner(System.in);
        ArrayList<int [][]>list=new ArrayList<int [][]>();
        int magic1[][]={{8,1,6},{3,5,7},{4,9,2}};
        list.add(magic1);
        int magic2[][]={{6,1,8},{7,5,3},{2,9,4}};
        list.add(magic2);
        int magic3[][]={{4,9,2},{3,5,7},{8,1,6}};
        list.add(magic3);
        int magic4[][]={{2,9,4},{7,5,3},{6,1,8}};
        list.add(magic4);
        int magic5[][]={{8,3,4},{1,5,9},{6,7,2}};
        list.add(magic5);
        int magic6[][]={{4,3,8},{9,5,1},{2,7,6}};
        list.add(magic6);
        int magic7[][]={{6,7,2},{1,5,9},{8,3,4}};
        list.add(magic7);
        int magic8[][]={{2,7,6},{9,5,1},{4,3,8}};
        list.add(magic8);
        int magic[][]=new int[3][3];
        for(int i=0;i<3;i++){
            for(int j=0;j<3;j++){
                magic[i][j]=in.nextInt();
            }
        }
        int lowestCost=Integer.MAX_VALUE;
        
        for(int i=0;i<list.size();i++){
            int currentCost=0;
            int magictemp[][]=list.get(i);
            for(int j=0;j<3;j++){
                for(int k=0;k<3;k++){
                    currentCost+=Math.abs(magictemp[j][k]-magic[j][k]);
                }
            }
            lowestCost=Math.min(lowestCost,currentCost);
        }
        System.out.print(lowestCost);
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
    }
}