using System;
using System.Collections.Generic;
using System.IO;
class Solution {
    static void Main(String[] args) {
        int[] r1 = Array.ConvertAll(Console.ReadLine().Split(' '), Int32.Parse);
        int[] r2 = Array.ConvertAll(Console.ReadLine().Split(' '), Int32.Parse);
        int[] r3 = Array.ConvertAll(Console.ReadLine().Split(' '), Int32.Parse);
        int[][] input = new int[][] { r1, r2, r3 };
        List<int[,]> combinations = new List<int [,]> { 
            new int[,] { {8, 1, 6}, {3, 5, 7}, {4, 9, 2} }, 
            new int[,] { {4, 3, 8}, {9, 5, 1}, {2, 7, 6} },
            new int[,] { {2, 9, 4}, {7, 5, 3}, {6, 1, 8} },
            new int[,] { {6, 7, 2}, {1, 5, 9}, {8, 3, 4} },
            new int[,] { {6, 1, 8}, {7, 5, 3}, {2, 9, 4} },
            new int[,] { {8, 3, 4}, {1, 5, 9}, {6, 7, 2} },
            new int[,] { {4, 9, 2}, {3, 5, 7}, {8, 1, 6} },
            new int[,] { {2, 7, 6}, {9, 5, 1}, {4, 3, 8} }
        };
        int minCost = int.MaxValue;
        foreach(int[,] combi in combinations){
            int combCost = 0;
            for( int i = 0; i < 3; i++){
                for ( int j = 0; j < 3; j++) {
                    if ( input[i][j] != combi[i,j]){
                        combCost += Math.Abs(input[i][j] - combi[i,j]);
                    }
                }
            }
            if ( combCost < minCost ){
                minCost = combCost;
            }
        }
        
        
        Console.WriteLine(minCost);
    }
}