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. */
        // The sum must be 15
        Integer[] mySquare;
        Integer[] cmpSquare;
        Scanner scan = new Scanner(System.in);
        mySquare = new Integer[9];
        int distanceCalculated;
        
        ArrayList<Integer[]> list = new ArrayList<>();
        
        Integer[] intArray1 = new Integer[]{2,9,4,7,5,3,6,1,8};
        list.add(intArray1);
        Integer[] intArray2 = new Integer[]{6,1,8,7,5,3,2,9,4};
        list.add(intArray2);
        Integer[] intArray3 = new Integer[]{8,1,6,3,5,7,4,9,2};
        list.add(intArray3);
        Integer[] intArray4 = new Integer[]{4,9,2,3,5,7,8,1,6};
        list.add(intArray4);
        Integer[] intArray5 = new Integer[]{6,7,2,1,5,9,8,3,4};
        list.add(intArray5);
        Integer[] intArray6 = new Integer[]{8,3,4,1,5,9,6,7,2};
        list.add(intArray6);
        Integer[] intArray7 = new Integer[]{2,7,6,9,5,1,4,3,8};
        list.add(intArray7);
        Integer[] intArray8 = new Integer[]{4,3,8,9,5,1,2,7,6};
        list.add(intArray8);
        
        for (int pos = 0; pos < 9; pos++) {
            mySquare[pos] = scan.nextInt();
        }
        Iterator it = list.iterator();
        int minDistance = 1000;
        while (it.hasNext()) {
            cmpSquare = (Integer[])it.next();
            distanceCalculated = calcDistanceArrays(cmpSquare,mySquare);
            if (minDistance > distanceCalculated) {
                minDistance = distanceCalculated;
            }
        }
   
        System.out.printf("%d",minDistance);
    }
    
    private static int calcDistanceArrays (Integer[] a1, Integer[] a2) {
        int dist = 0;
        for (int i=0; i<a1.length;i++) {
            dist = dist + Math.abs (a1[i] - a2[i]);
        }
        return dist;
     }
      
}