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) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */      Scanner scanner = new Scanner(System.in);
        ArrayList<Integer> totalCosts = new ArrayList<Integer>();
        int[] square = new int[9];
        
        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}};
        
        for (int i = 0;i<9;i++) {
                    square[i] = scanner.nextInt();
                }
        
        
     
        for(int i=0;i<8;i++) {
            int cost = 0;
            for (int j=0;j<9;j++) {
                
                cost = cost + Math.abs(square[j] - a[i][j]);
            }
        totalCosts.add(cost);
        }
       //System.out.println(totalCosts);
       System.out.println(Collections.min(totalCosts));



    }
    
}