#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <math.h>
#include <string.h>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int a[3][3];
    int min=0;
    int msq[8];
    memset(msq,0,sizeof(msq));
    int sq[8][3][3]={{ {8,1,6},{3,5,7},{4,9,2}},{{6,1,8},{7,5,3},{2,9,4}},{{8,3,4},{1,5,9},{6,7,2}},{{6,7,2},{1,5,9},{8,3,4}},{{4,9,2},{3,5,7},{8,1,6}},{{2,9,4},{7,5,3},{6,1,8}},{{2,7,6},{9,5,1},{4,3,8}},{{4,3,8},{9,5,1},{2,7,6}}};
    //int k=0;
    for(int i=0;i<3;i++)
        {
        for(int j=0;j<3;j++)
            {
            cin>>a[i][j];
            for(int k=0;k<8;k++)
         msq[k]+=abs(a[i][j]-sq[k][i][j]);   
        }
    }
    sort(msq,msq+8);
    cout<<msq[0]<<endl;
    return 0;
}