import java.io.*;
import java.util.*;
import java.util.function.Supplier;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
import java.util.stream.IntStream;

public class Solution {

    private static final List<List<List<Integer>>> MAGIC_SQUARES = Arrays.asList(
            Arrays.asList(
                    Arrays.asList(8, 1, 6),
                    Arrays.asList(3, 5, 7),
                    Arrays.asList(4, 9, 2)
            ),
            Arrays.asList(
                    Arrays.asList(6, 1, 8),
                    Arrays.asList(7, 5, 3),
                    Arrays.asList(2, 9, 4)
            ),
            Arrays.asList(
                    Arrays.asList(4, 3, 8),
                    Arrays.asList(9, 5, 1),
                    Arrays.asList(2, 7, 6)
            ),
            Arrays.asList(
                    Arrays.asList(2, 7, 6),
                    Arrays.asList(9, 5, 1),
                    Arrays.asList(4, 3, 8)
            ),
            Arrays.asList(
                    Arrays.asList(2, 9, 4),
                    Arrays.asList(7, 5, 3),
                    Arrays.asList(6, 1, 8)
            ),
            Arrays.asList(
                    Arrays.asList(4, 9, 2),
                    Arrays.asList(3, 5, 7),
                    Arrays.asList(8, 1, 6)
            ),
            Arrays.asList(
                    Arrays.asList(6, 7, 2),
                    Arrays.asList(1, 5, 9),
                    Arrays.asList(8, 3, 4)
            ),
            Arrays.asList(
                    Arrays.asList(8, 3, 4),
                    Arrays.asList(1, 5, 9),
                    Arrays.asList(6, 7, 2)
            )
    );

    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        List<List<Integer>> matrix = IntStream.range(0, 3)
                .boxed()
                .map(i -> readLine(br))
                .map(s -> Arrays.stream(s.split(" ")).map(Integer::valueOf).collect(Collectors.toList()))
                .collect(Collectors.toList());

        System.out.println(MAGIC_SQUARES.stream().mapToInt(ms -> getDiff(ms, matrix)).min().getAsInt());

    }

    private static int getDiff(List<List<Integer>> ms, List<List<Integer>> matrix) {
        int diff = 0;
        for (int i = 0; i < 3; i++) {
            for (int j = 0; j < 3; j++) {
                diff += Math.abs(ms.get(i).get(j) - matrix.get(i).get(j));
            }
        }
        return diff;
    }

    private static String readLine(BufferedReader br) {
        try {
            return br.readLine();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }


}