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

public class Solution {
    static int[][] ms0= {
          {4, 9, 2},
          {3, 5, 7},
          {8, 1, 6}
    };
    
    static int[][] ms1= {
          {2, 7, 6},
          {9, 5, 1},
          {4, 3, 8}
    };
    
    static int[][] ms2= {
          {6, 1, 8},
          {7, 5, 3},
          {2, 9, 4}
    };
    
    static int[][] ms3= {
          {8, 3, 4},
          {1, 5, 9},
          {6, 7, 2}
    };
    
    static int[][] ms4= {
          {2, 9, 4},
          {7, 5, 3},
          {6, 1, 8}
    };
    
    static int[][] ms5= {
          {6, 7, 2},
          {1, 5, 9},
          {8, 3, 4}
    };
    
    static int[][] ms6= {
          {8, 1, 6},
          {3, 5, 7},
          {4, 9, 2}
    };
    
    static int[][] ms7= {
          {4, 3, 8},
          {9, 5, 1},
          {2, 7, 6}
    };
    

    static int getCost(int[][] a, int[][] b){
        int cost = 0;
        for(int i=0; i<3; i++){
            for(int j=0; j<3; j++){
                cost+=Math.abs(a[i][j]-b[i][j]);
            }
        }
        
        return cost;
    }
    
    public 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];
        Scanner scan  = new Scanner(System.in);
        for(int i=0; i<3; i++){
            for(int j=0; j<3; j++){
                a[i][j] = scan.nextInt();
            }
        }
        
        int min = -1;
        List<int[][]> list = new ArrayList<>();
        list.add(ms0);
        list.add(ms1);
        list.add(ms2);
        list.add(ms3);
        list.add(ms4);
        list.add(ms5);
        list.add(ms6);
        list.add(ms7);
        
        for(int[][] ms:list){
            int cost = getCost(ms, a);
            if(min == -1){
                min = cost;
            }else{
                if(min>cost){
                    min = cost;
                }
            }
        }
        
        System.out.println(min);
       
    }
}