#include <iostream>
#include <math.h>
#include <algorithm>
using namespace std;


int main()
{

    int a1[3][3] = {{8,1,6},{3,5,7},{4,9,2}};
    int a2[3][3] = {{6,1,8},{7,5,3},{2,9,4}};
    int a3[3][3] = {{4,9,2},{3,5,7},{8,1,6}};
    int a4[3][3] = {{2,9,4},{7,5,3},{6,1,8}};
    int a5[3][3] = {{8,3,4},{1,5,9},{6,7,2}};
    int a6[3][3] = {{4,3,8},{9,5,1},{2,7,6}};
    int a7[3][3] = {{6,7,2},{1,5,9},{8,3,4}};
    int a8[3][3] = {{2,7,6},{9,5,1},{4,3,8}};
   int arr[3][3];
   int minSum[8] = {0};
   for(int i = 0; i < 3; i++)
   {
       for(int j = 0; j < 3; j++)
       {
           cin >> arr[i][j];
           if(arr[i][j] != a1[i][j])
           minSum[0] += abs(a1[i][j] - arr[i][j]);
           if(arr[i][j] != a2[i][j])
            minSum[1] += abs(a2[i][j] - arr[i][j]);
           if(arr[i][j] != a3[i][j])
            minSum[2] += abs(a3[i][j] - arr[i][j]);
           if(arr[i][j] != a4[i][j])
            minSum[3] += abs(a4[i][j] - arr[i][j]);
           if(arr[i][j] != a5[i][j])
            minSum[4] += abs(a5[i][j] - arr[i][j]);
           if(arr[i][j] != a6[i][j])
            minSum[5] += abs(a6[i][j] - arr[i][j]);
           if(arr[i][j] != a7[i][j])
            minSum[6] += abs(a7[i][j] - arr[i][j]);
           if(arr[i][j] != a8[i][j])
            minSum[7] += abs(a8[i][j] - arr[i][j]);


       }

   }

sort(minSum, minSum+8);
cout << minSum[0] << endl;




    return 0;
}