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

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. */
        Scanner in = new Scanner(System.in);
        int b[] = new int[9];
        
        for(int i=0;i<9;i++){ 
            b[i] = in.nextInt(); 
        }
        
        int a[][]={
            {8,1,6,3,5,7,4,9,2},
            {6,1,8,7,5,3,2,9,4},
            {4,9,2,3,5,7,8,1,6},
            {2,9,4,7,5,3,6,1,8},
            {8,3,4,1,5,9,6,7,2},
            {4,3,8,9,5,1,2,7,6},
            {6,7,2,1,5,9,8,3,4},
            {2,7,6,9,5,1,4,3,8}
        };
        
        int sol = Integer.MAX_VALUE;
        
        for (int i=0;i<8;i++){
            int cc=0;
            
            for(int j=0;j<9;j++){
                cc += Math.abs(a[i][j]-b[j]);
            }
            
            if(cc<sol){

                sol=cc;//finding least cost
            }
        }
        
        System.out.println(sol);
        
    }
}