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();

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

} // program