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 scan = new Scanner(System.in);
        
        int min = Integer.MAX_VALUE;
        
        int[][][] possible = new int[][][] {{{8, 1, 6}, {3, 5, 7}, {4, 9, 2}},
                                            {{4, 3, 8}, {9, 5, 1}, {2, 7, 6}},
                                            {{2, 9, 4}, {7, 5, 3}, {6, 1, 8}},
                                            {{6, 7, 2}, {1, 5, 9}, {8, 3, 4}},
                                            {{6, 1, 8}, {7, 5, 3}, {2, 9, 4}},
                                            {{8, 3, 4}, {1, 5, 9}, {6, 7, 2}},
                                            {{4, 9, 2}, {3, 5, 7}, {8, 1, 6}},
                                            {{2, 7, 6}, {9, 5, 1}, {4, 3, 8}}};
        int[] points = new int[possible.length];
        
        for (int r = 0; r < 3; r++) {
            for (int c = 0; c < 3; c++) {
                int temp = scan.nextInt();
                for (int i = 0; i < points.length; i++) {
                    points[i] += Math.abs(temp - possible[i][r][c]);
                }
            }
        }
        
        for (int i = 0; i < points.length; i++) {
            if (points[i] < min) min = points[i];
        }
        
        System.out.println(min);
    }
}