#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>

using namespace std;

int main() {
    vector <vector <int>> matrix(3, vector<int>(3));
    int magic[8][3][3] = {
       {{8,1,6},
        {3,5,7},
        {4,9,2}},
       {{6,1,8},
        {7,5,3},
        {2,9,4}},
       {{4,3,8},
        {9,5,1},
        {2,7,6}},
       {{2,7,6},
        {9,5,1},
        {4,3,8}},
       {{2,9,4},
        {7,5,3},
        {6,1,8}},
       {{4,9,2},
        {3,5,7},
        {8,1,6}},
       {{6,7,2},
        {1,5,9},
        {8,3,4}},
       {{8,3,4},
        {1,5,9},
        {6,7,2}}
    };
    
    
    vector <int> fila(3), column(3), diag(2);
    for(int i = 0; i < 3 ; i++)
        for(int j = 0; j < 3 ; j++ ){
        cin >> matrix[i][j];
    }
    int min = 50;
    for(int k=0; k < 8; k++){
        int diff = 0;
        for(int i = 0; i < 3 ; i++){
            for(int j = 0; j < 3 ; j++ ){
                diff += abs(matrix[i][j] - magic[k][j][i]);
            }
        }
        if(diff < min) min = diff;
    }
    
    cout << min;
    
    return 0;
}