public static void main(String args[]) {
        Scanner scan = new Scanner(System.in);
        String input = scan.next();
        int value = 0;
        try {
            value = Integer.valueOf(input).intValue();
            NumberFormat df = new DecimalFormat("##,###");
            System.out.println(df.format(value));
        } catch (NumberFormatException e) {
            System.out.println("输入的不是int型的数据。");
        }
    }