#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 magicSquares[8][3][3] = {
        {
            {8,1,6},
            {3,5,7},
            {4,9,2}
        },
        {
            {6,1,8},
            {7,5,3},
            {2,9,4}
        },
        {
            {4,3,8},
            {9,5,1},
            {2,7,6}
        },
        {
            {2,7,6},
            {9,5,1},
            {4,3,8}
        },
        {
            {2,9,4},
            {7,5,3},
            {6,1,8}
        },
        {
            {4,9,2},
            {3,5,7},
            {8,1,6}
        },
        {
            {6,7,2},
            {1,5,9},
            {8,3,4}
        },
        {
            {8,3,4},
            {1,5,9},
            {6,7,2}
        }
    };
    
    int mat[3][3] = {};
    
    int lowestCost = 100;
    
    int currCost;
    
    for(int i = 0; i < 3; i++){
        for (int j = 0; j < 3; j++){
            cin >> mat[i][j];
        }
    }
    
    for (int i = 0; i < 8; i++){
        currCost = 0;
        for (int j = 0; j < 3; j++){
            for (int k = 0; k < 3; k++){
                currCost += abs(mat[j][k] - magicSquares[i][j][k]);
            }
        }
        if (currCost < lowestCost){
            lowestCost = currCost;
        }
    }
    
    cout << lowestCost;
    
    return 0;
}