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. */
        int[][][] magicSquares = 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[][] square = new int[3][3];
        try(Scanner in = new Scanner(System.in)) {
            for(int i = 0; i < 3; i++) {
                for(int j = 0; j < 3; j++) {
                    square[i][j] = in.nextInt();
                }
            }
        }
        
        int min = Integer.MAX_VALUE;
        for(int s = 0; s < 8; s++) {
            int sum = 0;
            for(int i = 0; i < 3; i++) {
                for(int j = 0; j < 3; j++) {
                    sum += (int)Math.abs(square[i][j] - magicSquares[s][i][j]);
                }
            }
            min = Math.min(min, sum);
        }
        
        System.out.println(min);
    }
}