public class Main {
    public static void main(String[] args) throws Exception {

        if (args.length > 2 || args.length == 1) throw new Exception("Invalid input data");


        if (args.length == 0) {
            TableOfMultiplication table = new TableOfMultiplication();
            table.printTable();
        } else {
            try {
                Integer.parseInt(args[0]);
                Integer.parseInt(args[1]);
                if (Integer.parseInt(args[0]) <= 0 || Integer.parseInt(args[1]) <= 0) throw new Exception("Invalid input data");
                TableOfMultiplication table = new TableOfMultiplication(Integer.parseInt(args[0]), Integer.parseInt(args[1]));
                table.printTable();
            } catch (NumberFormatException e) {
                System.out.println("Input is not a number");
            }
        }
    }
}