using System;
using System.Collections.Generic;
using System.IO;
class Solution {
    static void Main(String[] args) {
         /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution*/
        int[,] a = new int[3,3];
        for(int i = 0; i < 3; i++){
            string line = Console.ReadLine();
            string[]fA = line.Split(' ');
            int j = 0;
            foreach(string num in fA){
                a[i,j] = Convert.ToInt32(num);
                j++;
            }
        }
        int[,]c1 = new int[3,3]{{8,1,6},{3,5,7},{4,9,2}};
        int[,]c2 = new int[3,3]{{6,1,8},{7,5,3},{2,9,4}};
        int[,]c3 = new int[3,3]{{8,3,4},{1,5,9},{6,7,2}};
        int[,]c4 = new int[3,3]{{6,7,2},{1,5,9},{8,3,4}};
        int[,]c5 = new int[3,3]{{4,9,2},{3,5,7},{8,1,6}};
        int[,]c6 = new int[3,3]{{2,9,4},{7,5,3},{6,1,8}};
        int[,]c7 = new int[3,3]{{4,3,8},{9,5,1},{2,7,6}};
        int[,]c8 = new int[3,3]{{2,7,6},{9,5,1},{4,3,8}};
        
        int min = residue(a,c1);
        
        if(residue(a,c2) < min){
            min = residue(a,c2);
        }
        if(residue(a,c3) < min){
            min = residue(a,c3);
        }
        if(residue(a,c4) < min){
            min = residue(a,c4);
        }
        if(residue(a,c5) < min){
            min = residue(a,c5);
        }
        if(residue(a,c6) < min){
            min = residue(a,c6);
        }
        if(residue(a,c7) < min){
            min = residue(a,c7);
        }
        if(residue(a,c8) < min){
            min = residue(a,c8);
        }
        Console.WriteLine(min);
    }
    
    static int residue(int[,] a, int[,]b){
        return Math.Abs(a[0,0]-b[0,0]) + Math.Abs(a[0,1]-b[0,1]) + Math.Abs(a[0,2]-b[0,2]) + 
            Math.Abs(a[1,0]-b[1,0]) + Math.Abs(a[1,1]-b[1,1]) + Math.Abs(a[1,2]-b[1,2]) + 
            Math.Abs(a[2,0]-b[2,0]) + Math.Abs(a[2,1]-b[2,1]) + Math.Abs(a[2,2]-b[2,2]);
    }
}