执行结果并不是每次都是5000，也有不是5000的啊，求解？？？
代码如下：
@Slf4j
@ThreadSafe
public class CountExample2 {

// 请求总数
public static int clientTotal = 5000;

// 同时并发执行的线程数
public static int threadTotal = 200;

// 计数
public static AtomicInteger count = new AtomicInteger(0);

public static void main(String[] args) throws Exception{
    ExecutorService executorService = Executors.newCachedThreadPool();
    final Semaphore semaphore = new Semaphore(threadTotal);
    final CountDownLatch countDownLatch = new CountDownLatch(threadTotal);
    for (int i = 0; i < clientTotal ; i++) {
        executorService.execute(() ->{
                    try {
                        semaphore.acquire();
                        add();
                        semaphore.release();
                    }catch (Exception e){
                        log.error("Exception: " + e);
                    }
            countDownLatch.countDown();
        });
    }
    countDownLatch.await();
    executorService.shutdown();
    log.info("count: " + count.get() );
}

private static void add(){
    count.incrementAndGet();
    //count.getAndIncrement();
}

}