#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 s[3][3];
    for (int i=0; i<3; i++) {
        for (int j=0; j<3; j++) {
            cin>>s[i][j];    
        }
    }
    int totalCost = 0;
    
    int ms[8][3][3] = {
    {8, 1, 6, 3, 5, 7, 4, 9, 2},
    {2, 9, 4, 7, 5, 3, 6, 1, 8},
    {4, 3, 8, 9, 5, 1, 2, 7, 6},
    {6, 7, 2, 1, 5, 9, 8, 3, 4},
    {4, 9, 2, 3, 5, 7, 8, 1, 6},
    {6, 1, 8, 7, 5, 3, 2, 9, 4},
    {8, 3, 4, 1, 5, 9, 6, 7, 2},
    {2, 7, 6, 9, 5, 1, 4, 3, 8}};
   
    int minDiff = 45;
    int minIndex = 0;
    
    for (int i=0 ; i < 8; i++) {
        int dif = 0;
        for (int j=0; j<3; j++) {
            for (int k=0; k<3; k++) {
                dif += abs(s[j][k] - ms[i][j][k]);
            }
        }
        
        if (dif < minDiff) {
            minIndex = i;
            minDiff = dif;
        }
    }
    
    cout<<minDiff<<endl;
    
    return 0;
}