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

public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int[][]matrix = new int[3][3];
        int costo = 0;
        for(int i=0; i<3;i++){
            for(int j=0; j<3;j++){
                matrix[i][j] = in.nextInt();
            }
        }
        
        if(esMagico(matrix)){
            System.out.println(costo);
        }else{
            System.out.println(solucion(matrix)); 
        }
     
    }
    
    public static boolean esMagico(int[][] matrix){
        boolean valor = true;
        int suma = 0;
        
        miLoop:
        for(int i=0; i<3;i++){
            for(int j=0; j<3;j++){
                suma += matrix[i][j];
            }
            
            if(suma == 15)
                suma = 0;
            else{
                valor = false;
                break miLoop;
            }
        }
        
        if(valor){
            int diagonal1 = matrix[0][0] + matrix[1][1] + matrix[2][2];
            int diagonal2 = matrix[0][2] + matrix[1][1] + matrix[2][0];
            if(diagonal1 == 15 && diagonal2 == 15){
                valor = true;
            }else{
                valor = false;
            }
        }
        
        return valor;
    }
       
    
    public static int costo(int a, int b){
        return  (a-b) >= 0? (a-b): (a-b)*-1;
    }
    
    public static int calCosto(int[][] matrix, int[][] solucion){
        int costo = 0;
        
        miLoop:
        for(int i=0; i<3;i++){
            for(int j=0; j<3;j++){
                costo += costo(matrix[i][j], solucion[i][j]);
            }
        }
        
        return costo;
    }
       
    
   public static int solucion(int[][] matrix){
       int[][] sol1 = {{4,9,2}, {3, 5, 7}, {8,1,6}};
       int[][] sol2 = {{8,3,4}, {1,5,9}, {6,7,2}};
       int[][] sol3 = {{6,1,8}, {7,5,3}, {2,9,4}};
       int[][] sol4 = {{2,7,6}, {9,5,1}, {4,3,8}};
       int[][] sol5 = {{8,1,6}, {3,5,7}, {4,9,2}};
       int[][] sol6 = {{6,7,2}, {1,5,9}, {8,3,4}};
       int[][] sol7 = {{2,9,4}, {7,5,3}, {6,1,8}};
       int[][] sol8 = {{4,3,8}, {9,5,1}, {2,7,6}};
       
       int a = calCosto(matrix, sol1);
       int b = calCosto(matrix, sol2);
       int c = calCosto(matrix, sol3);
       int d = calCosto(matrix, sol4);
       int e = calCosto(matrix, sol5);
       int f = calCosto(matrix, sol6);
       int g = calCosto(matrix, sol7);
       int h = calCosto(matrix, sol8);
       
       int min = 10000000;
       
       if (a<min){
           min = a; 
       }
       if (b<min){
           min = b; 
       }
       if (c<min){
           min = c; 
       }
       if (d<min){
           min = d; 
       }
       if (e<min){
           min = e; 
       }
       if (f<min){
           min = f; 
       }
       if (g<min){
           min = g; 
       }
       if (h<min){
           min = h; 
       }
             
       return min;
   }
}