For matrices

import java.util.Scanner;

public class Main {
    private Scanner in = new Scanner(System.in);

    public static void main(String[] args) {
        new Main().solve();
    }

    private void solve() {
        int[][] a = new int[3][3];
        for (int i = 0; i < 3; i++)
            for (int j = 0; j < 3; j++)
                a[i][j] = in.nextInt();

        int plus = 0;
        for (int i = 0; i < 3; i++) {
            int diag = 1;
            for (int j = 0; j < 3; j++)
                diag *= a[j][(i + j) % 3];
            plus += diag;
        }

        int minus = 0;
        for (int i = 2; i >= 0; i--) {
            int diag = 1;
            for (int j = 0; j < 3; j++)
                minus += a[j][(i - j + 3) % 3];
            minus += diag;
        }

        System.out.println(plus - minus);
    }
}