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

bool isMagic(vector <vector <int>> matrix)
    {
       if(!((matrix[0][0] + matrix[0][1] +matrix[0][2]) == 15))
           return false;
        if(!((matrix[1][0] + matrix[1][1] +matrix[1][2]) == 15))
           return false;
        if(!((matrix[2][0] + matrix[2][2] +matrix[2][2]) == 15))
           return false;
    if(!((matrix[0][0] + matrix[1][0] +matrix[2][0]) == 15))
           return false;
        if(!((matrix[1][0] + matrix[1][1] +matrix[1][2]) == 15))
           return false;
        if(!((matrix[2][2] + matrix[2][1] +matrix[2][2]) == 15))
           return false;
    if(!((matrix[0][0] + matrix[1][1] +matrix[2][2]) == 15))
           return false;
        if(!((matrix[0][2] + matrix[1][1] +matrix[2][0]) == 15))
           return false;
    cout<< " reached the end"<<endl;
    return true;
}

int findSquareDiff(vector <vector<int>> M1 , vector <vector<int>> M2){
    int diff = 0;
    for(int i = 0 ; i < 3 ; i++)
        for(int j = 0 ; j < 3 ; j++)
            diff += abs(M1[i][j] - M2[i][j]);
    return diff;
 }

int main() {
    vector <vector < vector<int>>> allSquares{{{4,9,2},{3,5,7},{8,1,6}},{{4,3,8},{9,5,1},{2,7,6}},{{8,1,6},{3,5,7},{4,9,2}},{{8,3,4},{1,5,9},{6,7,2}},{{2,9,4},{7,5,3},{6,1,8}},{{2,7,6},{9,5,1},{4,3,8}},{{6,7,2},{1,5,9},{8,3,4}},{{6,1,8},{7,5,3},{2,9,4}}};
    int minDiff = 1000;
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */ 
    int sum = 0;
    vector <vector <int>> matrix;
    for(int i = 0 ; i < 3 ; i++){
        vector<int> in;
        for(int j = 0; j <3 ; j++){
            int n;
            cin >> n ;
            in.push_back(n);
        }
        matrix.push_back(in);
    }
    for(int i = 0 ; i < 8 ; i++)/*{
        for(int r = 0 ; r < 3 ; r++){
            for(int c = 0 ; c < 3 ; c++)
                cout<< allSquares[i][r][c] << " ";
              cout << endl;
        }
        cout << endl;
    }*/
    minDiff > findSquareDiff(matrix,allSquares[i])  ? minDiff = findSquareDiff(matrix,allSquares[i]) : false;

    cout << minDiff;

    return 0;
}