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


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    
    int a[3][3],arr[8];
    for(int i=0;i<8;i++)
        arr[i]=0;
    
    int a1[3][3]={{2,7,6},{9,5,1},{4,3,8}};
    int a2[3][3]={{6,1,8},{7,5,3},{2,9,4}};
    int a3[3][3]={{8,3,4},{1,5,9},{6,7,2}};
    int a4[3][3]={{4,9,2},{3,5,7},{8,1,6}};
    int a5[3][3]={{6,7,2},{1,5,9},{8,3,4}};
    int a6[3][3]={{4,3,8},{9,5,1},{2,7,6}};
    int a7[3][3]={{8,1,6},{3,5,7},{4,9,2}};
    int a8[3][3]={{2,9,4},{7,5,3},{6,1,8}};
   
    for (int i=0;i<3;i++)
        {
            for(int j=0;j<3;j++)
                {
                cin>>a[i][j];
                }    
        }
    
    for (int i=0;i<3;i++)
        {
            for(int j=0;j<3;j++)
                {
                arr[0]+=abs(a1[i][j]-a[i][j]);
                arr[1]+=abs(a2[i][j]-a[i][j]);
                arr[2]+=abs(a3[i][j]-a[i][j]);
                arr[3]+=abs(a4[i][j]-a[i][j]);
                arr[4]+=abs(a5[i][j]-a[i][j]);
                arr[5]+=abs(a6[i][j]-a[i][j]);
                arr[6]+=abs(a7[i][j]-a[i][j]);
                arr[7]+=abs(a8[i][j]-a[i][j]);
                
                }    
        }

   
    sort(arr,arr+8);
    
    cout<<arr[0];
    
    return 0;
}