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

public class Solution {

    private static int calculateCost(int[]m1, int []m2) {
        int cost = 0;
        for (int i = 0; i < 9; i++) {
            cost += Math.abs(m1[i] - m2[i]);
        }

        return cost;
    }
    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 in = new Scanner(System.in);
        int[][] s = new int[][]{
                {4, 9, 2, 3, 5, 7, 8, 1, 6},
                {8, 3, 4, 1, 5, 9, 6, 7, 2},
                {6, 1, 8, 7, 5, 3, 2, 9, 4},
                {2, 7, 6, 9, 5, 1, 4, 3, 8},
                {8, 1, 6, 3, 5, 7, 4, 9, 2},
                {6, 7, 2, 1, 5, 9, 8, 3, 4},
                {2, 9, 4, 7, 5, 3, 6, 1, 8},
                {4, 3, 8, 9, 5, 1, 2, 7, 6}

        };
        int[] m = new int[9];
        for (int i = 0; i < 9; i++) {
            m[i] = in.nextInt();
        }
        int minCost = Integer.MAX_VALUE, cost;
        for (int i = 0; i < s.length; i++) {
            cost = calculateCost(m, s[i]);
            if (minCost > cost) minCost = cost;
        }
        System.out.println(minCost);
    }
}