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

int magic[8][9];
int s[9];
int num[10];

int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */
    int magic[8][9] = {{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}, {4,3,8,9,5,1,2,7,6}, {2,7,6,9,5,1,4,3,8}};
    //memset(num, -1, sizeof num);
    for(int i = 0; i < 3; ++i) {
        for(int j = 0; j < 3; ++j) {
            cin >> s[i + 3*j]; 
        }
    }
    int best = 1000;
    for(int i = 0; i < 8; ++i) {
        int sum = 0;
        for(int j = 0; j < 9; ++j) {
            sum += (magic[i][j] - s[j]) < 0?(s[j]-magic[i][j]):(magic[i][j]-s[j]);
        }
        if(sum < best) {
            best = sum;
        }
    }
    cout << best << endl;
    return 0;
}