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

public class Solution {
    
    static int[] s1 = new int[]{8,1,6,3,5,7,4,9,2};
    static int[] s2 = new int[]{6,1,8,7,5,3,2,9,4};
    static int[] s3 = new int[]{8,3,4,1,5,9,6,7,2};
    static int[] s4 = new int[]{4,3,8,9,5,1,2,7,6};
    static int[] s5 = new int[]{6,7,2,1,5,9,8,3,4};
    static int[] s6 = new int[]{2,7,6,9,5,1,4,3,8};
    static int[] s7 = new int[]{4,9,2,3,5,7,8,1,6};
    static int[] s8 = new int[]{2,9,4,7,5,3,6,1,8};
    
    public static int change(int[] arr, int[] solution) {
        int res = 0;
        for (int i = 0; i < 9; i++) {
            res += Math.abs(arr[i] - solution[i]);
        }
        return res;
    }

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int[] arr = new int[9];
        for (int i = 0; i < 9; i++) {
            arr[i] = sc.nextInt();
        }
        int[] f = new int[]{change(arr, s1), change(arr, s2), change(arr, s3), change(arr, s4), change(arr, s5), change(arr, s6),
                            change(arr, s7), change(arr, s8)};
        Arrays.sort(f);
        System.out.println(f[0]);
    }
}