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

int diff(const vector<vector<int>>& a, const vector<vector<int>>& b) {
    int sum = 0;
    for(int i=0;i<3;i++) {
        for(int j=0; j<3; j++)
            sum += abs(a[i][j] - b[i][j]);
    }
    return sum;
}

int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */
    vector<vector<int>> a(3, vector<int>(3));
    for(int i=0; i<3; i++)
        for(int j=0; j<3; j++)
            cin >> a[i][j];
    vector<vector<vector<int>>> b {
        {
            {4,9,2},
            {3,5,7},
            {8,1,6}
        },  // orig
        {
            {2,9,4},
            {7,5,3},
            {6,1,8}
        }, // flip horiz
        {
            {8,1,6},
            {3,5,7},
            {4,9,2}
        },  // flip vert
        {
            {6,1,8},
            {7,5,3},
            {2,9,4}
        },  // flip both
        {
            {8,3,4},
            {1,5,9},
            {6,7,2} 
        },  // rot 90 degree
        {
            {4,3,8},
            {9,5,1},
            {2,7,6} 
        },  // flip horiz
        {
            {6,7,2},
            {1,5,9},
            {8,3,4} 
        },  // flip vert
        {
            {2,7,6},
            {9,5,1},
            {4,3,8} 
        }  // flip both
    };

    int r = 0x7fffffff;
    for(const auto& p : b) r = min(r, diff(a, p));
    cout << r << endl;
    return 0;
}