#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;

int checkCost(int matrix[3][3], int reference[3][3]){
    
    int cost = 0;
    
    for(int i = 0; i < 3; i++){
        for(int j = 0; j < 3; j++){
           cost += reference[i][j] > matrix[i][j] ? reference[i][j] - matrix[i][j] : matrix[i][j] - reference[i][j];
        }
    }
    return cost;
}


int main() {
    int magic[][3][3] = {
                        {{2, 7, 6}, 
                         {9, 5, 1},
                         {4, 3 ,8}},
                            
                        {{6, 7, 2}, 
                         {1, 5, 9},
                         {8, 3 ,4}},
                            
                        {{4, 3, 8}, 
                         {9, 5, 1},
                         {2, 7 ,6}},
                            
                        {{6, 1, 8}, 
                         {7, 5, 3},
                         {2, 9 ,4}},
                            
                        {{8, 3, 4}, 
                         {1, 5, 9},
                         {6, 7 ,2}},
                            
                        {{2, 9, 4}, 
                         {7, 5, 3},
                         {6, 1 ,8}},
                            
                        {{4, 9, 2}, 
                         {3, 5, 7},
                         {8, 1 ,6}},
                            
                        {{8, 1, 6}, 
                         {3, 5, 7},
                         {4, 9 ,2}},
                      };
    
    int matrix[3][3];
    int cost = 0;

    vector <int> counts(10, 0);
    
    for(int i = 0; i < 3; i++){
        for(int j = 0;j < 3; j++){
            cin >> matrix[i][j];
        }
    }
    
    int min = 9 * 9;
    
    for(int i = 0; i < 8; i++){
        int calc = checkCost(matrix, magic[i]);
        if(calc < min)
            min = calc;
    }
    
    cout << min << endl;
        
}