#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <bits/stdc++.h>
using namespace std;


int main() {
    int arr[9],sum=INT_MAX,sumd=0;
    int all[8][9]={{4,9,2,3,5,7,8,1,6},{2,7,6,9,5,1,4,3,8},{6,1,8,7,5,3,2,9,4},{8,3,4,1,5,9,6,7,2},{2,9,4,7,5,3,6,1,8},{6,7,2,1,5,9,8,3,4},{8,1,6,3,5,7,4,9,2},{4,3,8,9,5,1,2,7,6}};
    for(int i=0;i<9;i++)
       cin>>arr[i];
    for(int i=0;i<8;i++)
        {
        sumd=0;
        for(int j=0;j<9;j++)
            {
            if(arr[j]!=all[i][j])
                {
                  sumd+=abs(arr[j]-all[i][j]);
                }
            }
          if(sumd<sum)
              sum=sumd;
        }
    cout<<sum<<endl;
    
    
    return 0;
}