/**
 * This program takes two inputs from the command
 * line, converting them from strings to integers,
 * then adding them.  This program improves on
 * SomeSum4 by adding that the user entered the
 * appropriate number of arguments.
 *
 * After compiling, run with:
 * $ java SumSome4 2 3
 */
class SumSome4 {
  public static void main(String[] args) {
    if (args.length != 2) {
      System.out.println("Usage: java SumSome4 <num_1> <num_2>");
      System.exit(1);
    }
    int x = Integer.valueOf(args[0]);
    int y = Integer.valueOf(args[1]);
    System.out.println(x + y);
  }
}