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) {
        Scanner in = new Scanner(System.in);
        int[] matrix = new int[9];
        int[][] posMats = {
            {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},
            {2,9,4,7,5,3,6,1,8},{4,3,8,9,5,1,2,7,6},{8,1,6,3,5,7,4,9,2},{6,7,2,1,5,9,8,3,4}
        };
        for (int i = 0; i < 9; i++) {
            matrix[i] = in.nextInt();
        }
        int min = 50;
        for (int i = 0; i < 8; i++) {
            if (min > compareMatrices(matrix,posMats[i])) {
                min = compareMatrices(matrix,posMats[i]);
            }
        }
        System.out.println(min);
    }
    
    public static int compareMatrices(int[] a, int[] b) {
        int sum = 0;
        for (int i = 0; i < 9; i++) {
            sum += Math.abs(a[i] - b[i]);
        }
        return sum;
    }
}