#include <iostream>
using namespace std;
struct wrapper {
int arr[3][3];
int used[10];
};
int global_match_val = 1000000;
  int check_valid(int arr[][3] ,int cost) {
    for ( int i = 0;i<3;i++) {
        if ( (  arr[i][0]+ arr[i][1]+arr[i][2] ) != 15 ) return 0;
    }
    for ( int i = 0;i<3;i++) {
        if ( (  arr[0][i]+ arr[1][i]+arr[2][i] ) != 15 ) return 0;
    }
    if ( (arr[0][0]+arr[1][1]+arr[2][2]) != 15 ) return 0 ;
    if ( (arr[0][2]+arr[1][1]+arr[2][0]) != 15 ) return 0 ;
   if ( global_match_val > cost ) global_match_val = cost;
   return 1;

  }

 int    check (wrapper wr , int row , int col , int cost)
  {
    int cost_min = 0 , temp_cost,temp_u,temp_a,cost_l;


   if ( cost > global_match_val ) return 0;
        if ( check_valid(wr.arr,cost) ) return cost;
       else {
               col++;
               if ( col >= 3 ) { row++ ;col = 0 ; }
               if ( row >= 3 ) return  0;
                for ( int i = 1 ; i<= 9 ; i++ ) {
                        if ( wr.used[i] != 0 ) {
                                temp_u = wr.used[i] ;
                                temp_a = wr.arr[row][col];
                                cost_l = abs(wr.arr[row][col] - wr.used[i]);
                                wr.arr[row][col] = wr.used[i];
                                wr.used[i] = 0 ;
                                temp_cost = check(wr,row,col,cost+cost_l) ;
                                if ( cost_min == 0 ) cost_min = temp_cost;
                                else  if ( temp_cost < cost_min ) cost_min = temp_cost ;
                                // restore
                                wr.arr[row][col] = temp_a ;
                                wr.used[i]  = temp_u;
                        }
             }
            return cost_min;
       }
  }

  wrapper wr;
int main() {
 int ans;
    for ( int i = 0;i<3;i++) {
        for ( int j = 0;j<3;j++) {
                cin>>wr.arr[i][j];
        }
    }
    for (int i = 1 ; i<10; i++) wr.used[i] = i ;
    ans = check (wr,0,-1 ,0);
     cout <<global_match_val<<endl;
    return 0;
}