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. */
        		int magicSquares[][][] = { { { 8, 1, 6 }, { 3, 5, 7 }, { 4, 9, 2 } }, { { 4, 3, 8 }, { 9, 5, 1 }, { 2, 7, 6 } },
				{ { 2, 9, 4 }, { 7, 5, 3 }, { 6, 1, 8 } }, { { 6, 7, 2 }, { 1, 5, 9 }, { 8, 3, 4 } },
				{ { 6, 1, 8 }, { 7, 5, 3 }, { 2, 9, 4 } }, { { 8, 3, 4 }, { 1, 5, 9 }, { 6, 7, 2 } },
				{ { 4, 9, 2 }, { 3, 5, 7 }, { 8, 1, 6 } }, { { 2, 7, 6 }, { 9, 5, 1 }, { 4, 3, 8 } } };

		Scanner in = new Scanner(System.in);
		int minValue = Integer.MAX_VALUE;
		int matrix[][] = new int[3][3];
		for (int i = 0; i < 3; i++) {
			for (int j = 0; j < 3; j++) {
				matrix[i][j] = in.nextInt();
			}
		}
		for (int i = 0; i < magicSquares.length; i++) {
			int curValue = 0;
			for (int j = 0; j < 3; j++) {
				for (int k = 0; k < 3; k++) {
					curValue += Math.abs(magicSquares[i][j][k] - matrix[j][k]);
				}
			}
			if (curValue < minValue) {
				minValue = curValue;
			}
		}
		System.out.println(minValue);
	
    }
}