import java.io.*;
import java.util.*;

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. */
        ArrayList<int[]> validSquares = new ArrayList<int[]>();
        int[] v = {4, 9, 2, 3, 5, 7, 8, 1, 6};
        validSquares.add(v);
        v = new int[]{8, 3, 4, 1, 5, 9, 6, 7, 2};
        validSquares.add(v);
        v = new int[]{6, 1, 8, 7, 5, 3, 2, 9, 4};
        validSquares.add(v);
        v = new int[]{2, 7, 6, 9, 5, 1, 4, 3, 8};
        validSquares.add(v);
        v = new int[]{2, 9, 4, 7, 5, 3, 6, 1, 8};
        validSquares.add(v);
        v = new int[]{8, 1, 6, 3, 5, 7, 4, 9, 2};
        validSquares.add(v);
        v = new int[]{6, 7, 2, 1, 5, 9, 8, 3, 4};
        validSquares.add(v);
        v = new int[]{4, 3, 8, 9, 5, 1, 2, 7, 6};
        validSquares.add(v);
        /*validSquares[1] = 
        validSquares[2] = 
        validSquares[3] = 
        validSquares[4] = 
        validSquares[5] = 
        validSquares[6] = 
        validSquares[7] = */
        
        Scanner sc = new Scanner(System.in);
        int[] square = new int[9];
        for (int i = 0; i < 9; i++) {
            square[i] = sc.nextInt();
        }
        
        int cost;
        int minCost = Integer.MAX_VALUE;
        for (int[] valid : validSquares) {
            cost = 0;
            for (int i = 0; i < 9; i++) {
                cost += Math.abs(square[i] - valid[i]);
            }
            if (cost < minCost) {
                minCost = cost;
            }
        }
        System.out.println(minCost);
        sc.close();
    }
}