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

public class Solution {
    static int sumof(int[] a,int[] b)
    {
        int s=0;
       for(int i=0;i<9;i++)
            {
                s+=Math.abs(a[i]-b[i]);
            }
            return s;
            
            
    }

    public static void main(String[] args) {
       int[][] m={{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},{6,7,2,1,5,9,8,3,4},{8,1,6,3,5,7,4,9,2},{4,3,8,9,5,1,2,7,6}};
       int[] a=new int[9];
       Scanner in=new Scanner(System.in);
       for(int i=0;i<9;i++)
       a[i]=in.nextInt();
       int min=9999;
       int sum=0;
       for(int j=0;j<8;j++)
       {
         sum=sumof(a,m[j]);
         if(sum<min)
          min=sum;
       }
       System.out.println(min);
    }
}