class Tenker {
    public static void main(String[] args) {
        Runnable tenk = new TenkeTask();
        Thread tenker1 = new Thread(tenk);
        Thread tenker2 = new Thread(tenk);
        tenker1.start();
        tenker2.start();
    }
}



class TenkeTask implements Runnable {
    @Override
    public void run() {
        for (int i = 0; i < 5000; i++) {
            if (i % 1000 == 0) {
                System.out.printf("Hei! Naa har jeg tenkt %d ganger\n", i / 1000);
            }
        }
    }
}