#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>

using namespace std;

int calcScore(int magic[3][3], int m[3][3], int i, int j) {
    if (magic[i][j] != m[i][j]) {
        if (magic[i][j] - m[i][j] < 0) {
            return -1 * (magic[i][j] - m[i][j]);
        } else {
            return magic[i][j] - m[i][j];
        }
    }
    return 0;
}

int main() {
    int n = 3;
    int score[8] = {0, 0, 0, 0, 0, 0, 0, 0};
    int m[3][3];
    
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            scanf("%d", &m[i][j]);
        }
    }
    
    int magic1[3][3] = {{8, 1, 6}, {3, 5, 7}, {4, 9, 2}};
    int magic2[3][3] = {{6, 1, 8}, {7, 5, 3}, {2, 9, 4}};
    int magic3[3][3] = {{4, 3, 8}, {9, 5, 1}, {2, 7, 6}};
    int magic4[3][3] = {{2, 7, 6}, {9, 5, 1}, {4, 3, 8}};
    int magic5[3][3] = {{2, 9, 4}, {7, 5, 3}, {6, 1, 8}};
    int magic6[3][3] = {{4, 9, 2}, {3, 5, 7}, {8, 1, 6}};
    int magic7[3][3] = {{6, 7, 2}, {1, 5, 9}, {8, 3, 4}};
    int magic8[3][3] = {{8, 3, 4}, {1, 5, 9}, {6, 7, 2}};
    
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            score[0] += calcScore(magic1, m, i, j);
            score[1] += calcScore(magic2, m, i, j);
            score[2] += calcScore(magic3, m, i, j);
            score[3] += calcScore(magic4, m, i, j);
            score[4] += calcScore(magic5, m, i, j);
            score[5] += calcScore(magic6, m, i, j);
            score[6] += calcScore(magic7, m, i, j);
            score[7] += calcScore(magic8, m, i, j);
        }
    }  
    
    int min = score[0];
    for (int i = 1; i < 8; i++) {
        if (min > score[i])
            min = score[i];
    }
    
    printf("%d\n", min);
    
    return 0;
}