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) {
        int[][] s = new int[3][3];
        int ms[][] = {
          { 8, 1, 6 },
          { 3, 5, 7 },
          { 4, 9, 2 }
        };
        Scanner sc = new Scanner(System.in);
        for(int i=0;i<3;i++) 
            for(int j=0;j<3;j++) 
                s[i][j] = sc.nextInt();
        int dif1=0, dif2=0, dif3=0, dif4=0,
             dif5=0, dif6=0, dif7=0, dif8=0;    
        for(int i=0;i<3;i++) 
            for(int j=0;j<3;j++) {
                dif1+=Math.abs(s[i][j]-ms[i][j]);
                dif2+=Math.abs(s[i][j]-ms[2-i][j]);
                dif3+=Math.abs(s[i][j]-ms[i][2-j]);
                dif4+=Math.abs(s[i][j]-ms[2-i][2-j]);
                
                dif5+=Math.abs(s[i][j]-ms[j][i]);
                dif6+=Math.abs(s[i][j]-ms[2-j][i]);
                dif7+=Math.abs(s[i][j]-ms[j][2-i]);
                dif8+=Math.abs(s[i][j]-ms[2-j][2-i]);
            }    
        System.out.println(Math.min(Math.min(Math.min(dif1,dif2),Math.min(dif3,dif4)),
                                    Math.min(Math.min(dif5,dif6),Math.min(dif7,dif8))));
    }
}