import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        Scanner scan = new Scanner (System.in);
        int[] a = new int[9];
        int minDiff = 999999;
        for (int i = 0; i < 9; i++) {
            a[i] = scan.nextInt();
        }
        scan.close();
        int[][] squares = new int[][] {
            {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, 3, 8, 9, 5, 1, 2, 7, 6},
            {2, 7, 6, 9, 5, 1, 4, 3, 8},
            {4, 9, 2, 3, 5, 7, 8, 1, 6},
            {2, 9, 4, 7, 5, 3, 6, 1, 8}
        };
        for (int i = 0; i < 8; i++) {
            int diff = 0;
            for (int j = 0; j < 9; j++) {
                diff+= Math.abs(a[j] - squares[i][j]);
            }
            if (diff < minDiff) minDiff = diff;
        }
        
        System.out.println(minDiff);
    }
}