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

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

} // program