Java

import java.util.Scanner;

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

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

        int klomba = ((3 * n) + 6) - (n + 2);
        int space = 0;

        for (int i = 0; i < n; i++) {
            String row = "";

            row = repeatStr(" ", n - 1) + repeatStr(" ~", (n * 3) / n);
            System.out.println(row);
        }
        System.out.println(repeatStr("=", (3 * n + 5)) + " ");

        for (int i = 1; i <= n - 2; i++) {
            String row = "";
            if  (i == n / 2) {

                row = "|" + repeatStr("~", n) + "JAVA" + repeatStr("~", n)
                        + "|" + repeatStr(" ", n - 1) + "|";
            }else{
                row = "|" + repeatStr("~", n * 2 + 4)
                        + "|" + repeatStr(" ", n - 1) + "|";
            }
            System.out.println(row);

        }
        System.out.println(repeatStr("=", 3 * n + 5));

        for (int i = 0; i < n; i++) {
            String row = "";

            row = repeatStr(" ", space)
                    + repeatStr("\\", (n * n) / (n * n))
                    + repeatStr("@", klomba)
                    + repeatStr("/", (n * n) / (n * n));
            space += 1;
            System.out.println(row);
            klomba -= 2;
        }
        System.out.println(repeatStr("=", (3 * n + 6) - n));
    }

    static String repeatStr(String strToRepeat, int count) {
        String text = "";

        for (int i = 0; i < count; i++) {
            text = text + strToRepeat;
        }
        return text;
    }
}