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

public class Solution {
    public static final int ps1[][] = {
        {4, 9, 2},
        {3, 5, 7},
        {8, 1, 6}
    };
    public static final int ps2[][] = {
        {8, 1, 6},
        {3, 5, 7},
        {4, 9, 2}
    };
    public static final int ps3[][] = {
        {6, 7, 2},
        {1, 5, 9},
        {8, 3, 4}
    };
    public static final int ps4[][] = {
        {2, 9, 4},
        {7, 5, 3},
        {6, 1, 8}
    };
    public static final int ps5[][] = {
        {4, 3, 8},
        {9, 5, 1},
        {2, 7, 6}
    };
    public static final int ps6[][] = {
        {8, 3, 4},
        {1, 5, 9},
        {6, 7, 2}
    };
    public static final int ps7[][] = {
        {2, 7, 6},
        {9, 5, 1},
        {4, 3, 8}
    };
    public static final int ps8[][] = {
        {6, 1, 8},
        {7, 5, 3},
        {2, 9, 4}
    };
    public static final int perfectSquares[][][] = {ps1,ps2,ps3,ps4,ps5,ps6,ps7,ps8};
    
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int s[][] = new int[3][3];
        
        for(int i = 0; i < 3; i++){
            for(int j = 0; j < 3; j++){
                s[i][j] = scan.nextInt();
            }
        }
        
        int minCost = calculateSquareChangeCost(s,ps1);
        
        for(int i = 1; i < 8; i++){
            int cost = calculateSquareChangeCost(s, perfectSquares[i]);
            if(cost < minCost){
                minCost = cost;
            }
        }
        
        System.out.println(minCost);
    }
    
    private static int calculateSquareChangeCost(int a[][], int b[][]){
        return Math.abs(a[0][0] - b[0][0]) + Math.abs(a[1][0] - b[1][0]) + Math.abs(a[2][0] - b[2][0]) +
               Math.abs(a[0][1] - b[0][1]) + Math.abs(a[1][1] - b[1][1]) + Math.abs(a[2][1] - b[2][1]) +
               Math.abs(a[0][2] - b[0][2]) + Math.abs(a[1][2] - b[1][2]) + Math.abs(a[2][2] - b[2][2]);
            
    }
}