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


int main() {
    int a[8][9]={{8,1,6,3,5,7,4,9,2},{6,1,8,7,5,3,2,9,4},{4,9,2,3,5,7,8,1,6},{2,9,4,7,5,3,6,1,8},{8,3,4,1,5,9,6,7,2},{4,3,8,9,5,1,2,7,6},{6,7,2,1,5,9,8,3,4},{2,7,6,9,5,1,4,3,8}};
    int m[9], min = 0, sum = 999;
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    for (int i = 0; i < 9; i++)
        cin >> m[i];
    for (int i = 0; i < 8; i++) {
        min = 0;
        for (int j = 0; j < 9; j++)
                min += int(abs(m[j] - a[i][j]));
        if (min < sum)
            sum = min;
    }
    cout << sum << endl;
    return 0;
}