// $Id: Waiting.java,v 1.2 2000-06-25 19:25:19+09 kaiya Exp kaiya $

import java.util.*;

class Waiting{
private Random r;
	Waiting(){
		r=new Random();
	}
	void wait(Thread t){
		int w=r.nextInt(); w=(w>0? w: w*(-1))%500;
		try{
			t.sleep(w);
		}catch(InterruptedException e){
		}
	}
}