#include <iostream>
#include <stdio.h>
#include <bits/stdc++.h>

#define f first
#define s second

using namespace std;
int mainArr[3][3];
int minVal = 10000;
int newArr[3][3];

int validNewArray()
{
    int sum = newArr[0][0] + newArr[0][1] + newArr[0][2];
    int diagDiff = sum - newArr[0][0] - newArr[1][1];
    if(diagDiff <= 0 || diagDiff > 9)
        return -1;
    else
        newArr[2][2] = diagDiff;
    diagDiff = sum - newArr[0][2] - newArr[1][1];
    if(diagDiff <= 0 || diagDiff > 9)
        return -1;
    else
        newArr[2][0] = diagDiff;
    diagDiff = sum - newArr[0][0] - newArr[2][0];
    if(diagDiff <= 0 || diagDiff > 9)
        return -1;
    else
        newArr[1][0] = diagDiff;
    diagDiff = sum - newArr[0][1] - newArr[1][1];
    if(diagDiff <= 0 || diagDiff > 9)
        return -1;
    else
        newArr[2][1] = diagDiff;
    diagDiff = sum - newArr[0][2] - newArr[2][2];
    if(diagDiff <= 0 || diagDiff > 9)
        return -1;
    else
        newArr[1][2] = diagDiff;
    int minDif = 0;
    int newType[10];
    for(int counter = 0; counter < 10; counter++)
        newType[counter] = 0;
    for(int counter = 0; counter < 3; counter++)
    {
        if(sum != newArr[counter][0] + newArr[counter][1] + newArr[counter][2])
            return -1;
    }
    for(int counter = 0; counter < 3; counter++)
    {
        for(int counter2 = 0; counter2 < 3; counter2++)
        {
            newType[newArr[counter][counter2]]++;
            minDif += max(newArr[counter][counter2], mainArr[counter][counter2])
            - min(newArr[counter][counter2], mainArr[counter][counter2]);
        }
    }
    for(int counter = 1; counter < 10; counter++)
        if(newType[counter] != 1)
            return -1;
    return minDif;
}
int main(){
    for(int counter = 0; counter < 3; counter++)
        for(int counter2 = 0; counter2 < 3; counter2++)
            cin >> mainArr[counter][counter2];
    for(int counter1 = 1; counter1 < 10; counter1++)
    {
        for(int counter2 = 1; counter2 < 10; counter2++)
        {
            for(int counter3 = 1; counter3 < 10; counter3++)
            {
                for(int counter4 = 1; counter4 < 10; counter4++)
                {
                    newArr[0][0] = counter1;
                    newArr[0][1] = counter2;
                    newArr[0][2] = counter3;
                    newArr[1][1] = counter4;
                    int val = validNewArray();
                    if(val == -1)
                        continue;
                    if(val < minVal)
                        minVal = val;
                }
            }
        }
    }
    cout << minVal << endl;
    return 0;
}