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 sc = new Scanner(System.in);
		Integer[] matrix = new Integer[9];
		for (int i = 0; i < 9; i++)
		{
			matrix[i] = sc.nextInt();
		}
		List<Integer> arrayList = new ArrayList<>();
		Integer[][] squares = { { 6, 1, 8, 7, 5, 3, 2, 9, 4 }, { 8, 1, 6, 3, 5, 7, 4, 9, 2 }, { 8, 3, 4, 1, 5, 9, 6, 7, 2 }, { 6, 7, 2, 1, 5, 9, 8, 3, 4 }, { 2, 7, 6, 9, 5, 1, 4, 3, 8 }, { 4, 3, 8, 9, 5, 1, 2, 7, 6 }, { 4, 9, 2, 3, 5, 7, 8, 1, 6 }, { 2, 9, 4, 7, 5, 3, 6, 1, 8 } };
		Integer minChange = 0;
		for (Integer i = 0; i < 8; i++)
		{
			for (Integer j = 0; j < 9; j++)
			{
				minChange += Math.abs(matrix[j] - squares[i][j]);
			}
			arrayList.add(minChange);
			minChange = 0;
		}
		Collections.sort(arrayList);
		System.out.println(arrayList.get(0));
		sc.close();
    }
}