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

public class Solution {

    public static int compare(Integer[] a, Integer[] b){
        int sum = 0;
        for (int i = 0; i < a.length; i++){
            sum += Math.abs(a[i] - b[i]);
        }
        
        return sum;
    }
    
    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);
        Integer[] a = new Integer[9];
        
        for (int i = 0; i < a.length; i++){
            a[i] = scan.nextInt();
        }
        
        ArrayList<Integer[]> m_squares = new ArrayList<Integer[]>();
        m_squares.add(new Integer[]{4, 9, 2, 3, 5, 7, 8, 1, 6});
        m_squares.add(new Integer[]{2, 7, 6, 9, 5, 1, 4, 3, 8});
        m_squares.add(new Integer[]{6, 1, 8, 7, 5, 3, 2, 9, 4});
        m_squares.add(new Integer[]{8, 3, 4, 1, 5, 9, 6, 7, 2});
        m_squares.add(new Integer[]{2, 9, 4, 7, 5, 3, 6, 1, 8});
        m_squares.add(new Integer[]{6, 7, 2, 1, 5, 9, 8, 3, 4});
        m_squares.add(new Integer[]{8, 1, 6, 3, 5, 7, 4, 9, 2});
        m_squares.add(new Integer[]{4, 3, 8, 9, 5, 1, 2, 7, 6});
        
        int min_value = 1000;
        for (Integer[] square: m_squares){
            int value = compare(square, a);
            if (value < min_value){
                min_value = value;
            }
        }
        
        System.out.println(min_value);
    }
}