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

public class Solution {

   public static void main(String args[]){
	Scanner input = new Scanner(System.in);
    int num[]=new int[9];
    int ans[] = new int[8];
    for(int i=0;i<9;i++)
			 num[i]=input.nextInt();

   int m1[]={8,1,6,3,5,7,4,9,2};
   int m2[]={4,3,8,9,5,1,2,7,6};
   int m3[]={2,9,4,7,5,3,6,1,8};
   int m4[]={6,7,2,1,5,9,8,3,4};
   int m5[]={6,1,8,7,5,3,2,9,4};
   int m6[]={8,3,4,1,5,9,6,7,2};
   int m7[]={4,9,2,3,5,7,8,1,6};
   int m8[]={2,7,6,9,5,1,4,3,8};
   ans[0]=check(num,m1);
   ans[1]=check(num,m2);
  ans[2]=check(num,m3);
   ans[3]=check(num,m4);
   ans[4]=check(num,m5);
   ans[5]=check(num,m6);
   ans[6]=check(num,m7);
   ans[7]=check(num,m8);
   Arrays.sort(ans);
   int max = ans[0];
 
   System.out.println(max);
   
   }
   static int check(int x[],int y[]){
	   int res=0;
	   for(int i=0;i<9;i++){
		   res=res+Math.abs(x[i]-y[i]);
	   }
	   
	   
	   
	   return res;
   }
   
   }