// Incremental Process

import java.util.*;

class Inc extends Thread{
private Counter c;
private final static int often=10;
private Random r=new Random();

	Inc(Counter c){ this.c=c; }

	public void run(){
		for(int i=0; i<often; i++){
			synchronized(c){
				int tmp=c.get();
				tmp++;
				try{ sleep(r.nextInt(2));}catch(Exception e){}
				c.set(tmp);
			}
		}
	}

	public static void main(String[] args){
		Counter c=new Counter();
		for(int i=0; i<3; i++)
			new Inc(c).start();
	}
}