public class ThreadTester {
	public static void main(String[] args) {
		if (args.length > 0) {
			if (Integer.parseInt(args[0]) < 0)
				System.err.println(args[0] + " must be >= 0.");
			else {
				Summation thrd = new Summation (Integer.parseInt(args[0]));
				thrd.start();
			}
		}
		else
			System.err.println("Usage: ThreadTester <integer value>");
	}
}