#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;

int Diff(vector<int> inputSquare, vector<int> comparedSquare) {
    //Input: Takes in 2 squares
    //Output: Returns the diff between the two, in cost.
    int value = 0;
    for (int i=0; i<9; i++) {
        value = value + abs(inputSquare[i]-comparedSquare[i]);
    }
    return value;
}

int main() {
    //Input
    int number; 
    vector<int> inputSquare;
    for (int i=0; i<9; i++) {
        cin >> number;
        inputSquare.push_back(number);
    }
    
    //Define some stuffs
    vector< vector < int > > magicSquares;

    vector<int> square1 {6,7,2,1,5,9,8,3,4};
    vector<int> square2 {8,3,4,1,5,9,6,7,2};
    vector<int> square3 {2,7,6,9,5,1,4,3,8};
    vector<int> square4 {4,3,8,9,5,1,2,7,6};
    vector<int> square5 {8,1,6,3,5,7,4,9,2};
    vector<int> square6 {6,1,8,7,5,3,2,9,4};
    vector<int> square7 {4,9,2,3,5,7,8,1,6};
    vector<int> square8 {2,9,4,7,5,3,6,1,8};

    magicSquares.push_back(square1);
    magicSquares.push_back(square2);
    magicSquares.push_back(square3);
    magicSquares.push_back(square4);
    magicSquares.push_back(square5);
    magicSquares.push_back(square6);
    magicSquares.push_back(square7);
    magicSquares.push_back(square8); //TA-DA!
    
    //Algorithm
    int minCost = 9001; //A big number, a lil over 9000.
    for (vector<int> square: magicSquares) {
        int minDiff = Diff(inputSquare, square);
        if (minDiff < minCost) {
            minCost = minDiff;
        }
    }
    
    //Output
    cout << minCost;
    return 0;
}