#include <iostream>
#include <cmath>
using namespace std;

int squares[][3][3]= {
    {
        {4,9,2},
        {3,5,7},
        {8,1,6}
    },
    {
        {2,9,4},
        {7,5,3},
        {6,1,8}
    },
    {
        {8,1,6},
        {3,5,7},
        {4,9,2}
    },
    {
        {6,1,8},
        {7,5,3},
        {2,9,4}
    },
    {
        {8,3,4},
        {1,5,9},
        {6,7,2}
    },
    {
        {6,7,2},
        {1,5,9},
        {8,3,4}
    },
    {
        {2,7,6},
        {9,5,1},
        {4,3,8}
    },
    {
        {4,3,8},
        {9,5,1},
        {2,7,6}
    }
};

int diff(int square[3][3], int index)
{
    int diff= 0;
    for (int i= 0; i < 3; ++i)
        for (int j= 0; j < 3; ++j)
            diff+= abs(square[i][j] - squares[index][i][j]);
    return diff;
}

int main() {
    int square[3][3];
    int min_cost= 1000000;
    for (int i= 0; i < 3; ++i)
        for (int j= 0; j < 3; ++j)
            cin >> square[i][j];
    for (int i= 0; i < 8; ++i) {
        int d= diff(square, i);
        if (d <= min_cost)
            min_cost= d;
    }
    cout << min_cost << endl;
}