class Demo {
    public static void main (String[] args) {
	System.out.println("length " + args.length);
	int sum = 0;
	for (int i = 0; i < args.length; i++) {
	    int n = 0;
	    try {
		n = Integer.parseInt(args[i]);
	    }
	    catch (NumberFormatException e) {
		System.out.println("invalid number");
	    }
	    sum += n;
	}
	System.out.println("The sum is " + sum);
    }
}