using System;
using System.Collections.Generic;
using System.IO;
class Solution {
    static void Main(String[] args) {
        string[] line1 = Console.ReadLine().Split(' ');
        string[] line2 = Console.ReadLine().Split(' ');
        string[] line3 = Console.ReadLine().Split(' ');
        
        int[][] matrix = new int[3][];
        matrix[0] = Array.ConvertAll(line1, Int32.Parse);
        matrix[1] = Array.ConvertAll(line2, Int32.Parse);
        matrix[2] = Array.ConvertAll(line3, Int32.Parse);
        
        List<Template> templates = new List<Template>();
        templates.Add( new Template(2, 7, 6, 9, 5, 1, 4, 3, 8) );
        templates.Add( new Template(2, 9, 4, 7, 5, 3, 6, 1, 8) );
        templates.Add( new Template(4, 9, 2, 3, 5, 7, 8, 1, 6) );
        templates.Add( new Template(4, 3, 8, 9, 5, 1, 2, 7, 6) );
        templates.Add( new Template(8, 3, 4, 1, 5, 9, 6, 7, 2) );
        templates.Add( new Template(8, 1, 6, 3, 5, 7, 4, 9, 2) );
        templates.Add( new Template(6, 1, 8, 7, 5, 3, 2, 9, 4) );
        templates.Add( new Template(6, 7, 2, 1, 5, 9, 8, 3, 4) );
        
        int minCost = int.MaxValue;
        foreach(Template t in templates) {
            int cost = 0;
            for(int i = 0; i < 3; i++) {
                for(int j = 0; j < 3; j++) {
                    cost += Math.Abs(matrix[i][j] - t.temp[i][j]);
                }
            }
            if(cost < minCost)
                minCost = cost;
        }
        
        Console.WriteLine(minCost);
    }
    
    public struct Template {
        public int[][] temp;
        
        public Template(int _11, int _12, int _13, int _21, int _22, int _23, int _31, int _32, int _33) {
            temp = new int[3][];
            temp[0] = new int[] { _11, _12, _13 };
            temp[1] = new int[] { _21, _22, _23 };
            temp[2] = new int[] { _31, _32, _33 };
        }
    }
}