Шевица

import java.util.Scanner;

public class demo {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int n = Integer.parseInt(scanner.nextLine());

        String firstAndLastLine = repeatStr(".", (n * 3 - 1) / 2)
                + "x"
                + repeatStr(".", (n * 3 - 1) / 2);
        System.out.println(firstAndLastLine);

        String secondLine = repeatStr(".", (n * 3 - 3) / 2)
                + "/x\\"
                + repeatStr(".", (n * 3 - 3) / 2);
        System.out.println(secondLine);

        String thirdLine =  repeatStr(".", (n * 3 - 3) / 2)
                + "x|x"
                + repeatStr(".", (n * 3 - 3) / 2);
        System.out.println(thirdLine);


        for (int i = 0; i < n / 2; i++) {
            String line = repeatStr(".", (3 * n - 1) / 2 - n - i)
                    + repeatStr("x", n + i)
                    + "|"
                    + repeatStr("x", n + i)
                    + repeatStr(".", (3 * n - 1) / 2 - n - i);
            System.out.println(line);
        }

        String middle = repeatStr("x", (n * 3 - 1) / 2)
                + "|"
                + repeatStr("x", (n * 3 - 1) / 2);
        System.out.println(middle);

        for (int i = 1; i <= n / 2; i++) {
            String line = repeatStr(".", i )
                    + repeatStr("x", (n * 3 - 1) / 2 - i)
                    + "|"
                    + repeatStr("x", (n * 3 - 1) / 2 - i)
                    + repeatStr(".", i );
            System.out.println(line);
        }
        System.out.println(secondLine);
        String middleLine = repeatStr(".", (n * 3 - 3) / 2)
                + "\\x/"
                + repeatStr(".", (n * 3 - 3) / 2);
        System.out.println(middleLine);

        // middle part is ready

        for (int i = 0; i < n / 2; i++) {
            String line = repeatStr(".", (3 * n - 1) / 2 - n - i)
                    + repeatStr("x", n + i)
                    + "|"
                    + repeatStr("x", n + i)
                    + repeatStr(".", (3 * n - 1) / 2 - n - i);
            System.out.println(line);
        }
        System.out.println(middle);

        for (int i = 1; i <= n / 2; i++) {
            String line = repeatStr(".", i )
                    + repeatStr("x", (n * 3 - 1) / 2 - i)
                    + "|"
                    + repeatStr("x", (n * 3 - 1) / 2 - i)
                    + repeatStr(".", i );
            System.out.println(line);
        }
        System.out.println(thirdLine);
        System.out.println(middleLine);
        System.out.println(firstAndLastLine);

    }

    static String repeatStr(String strToRepeat, int count) {
        String text = "";
        for (int i = 0; i < count; i++) {
            text += strToRepeat;
        }
        return text;
    }
}