public class Semaphore {
	private int count;

	public Semaphore(int n) {
		this.count = n;
	}

	public synchronized void acquire() {
		while (count == 0) {
			try {
				wait();
			}
			catch (InterruptedException e) {
			}
		}
		count--;
	}

	public synchronized void release() {
		count++;
		notify();
	}
}