Aerox1

    public static void main(String[] args) { 
        int n = Integer.parseInt(args[0]);
        for (int i = -3*n/2; i <= n; i++) {
            for (int j = -3*n/2; j <= 3*n/2; j++) {

                if ((Math.abs(i) + Math.abs(j) < n)
                    || ((-n/2-i) * (-n/2-i) + ( n/2-j) * ( n/2-j) <= n*n/2)
                    || ((-n/2-i) * (-n/2-i) + (-n/2-j) * (-n/2-j) <= n*n/2)) {
                    System.out.print("* ");
                }