program TurnstileMain {

	// checking the number of arguments
	if(args.length==0) {
		
		System.out.println("The number of turnstiles is missing");
		System.exit(1);
	
	}
	
	Turnstile turnstiles[] = null;
	
	try {
		
		turnstiles= new Turnstile[Integer.parseInt(args[0])];
	
	}catch(NumberFormatException e) {
	
		e.printStackTrace();
		System.exit(2);
	
	}
	
	
	Counter c = new Counter();

	cobegin {
	    
		for(int i=0;i< turnstiles.length;i++) {
			turnstiles[i]= new Turnstile(c);
		} // done
	
	} // cobegin
	
	System.out.printf("counter value: %d\n",c.getValue());

} // program