...
public class ComputeMul {
 public static void main(String args[]){
 if (System.getSecurityManager() == null) {
   System.setSecurityManager(new RMISecurityManager());}
 try {
  String name = "//" + args[0] + "/Compute";
  Compute comp = (Compute) Naming.lookup(name);
  Multiply task = new Multiply(new BigInteger(args[1]),
   new BigInteger(args[2]));
  BigInteger mul = (BigInteger) (comp.executeTask(task));
  System.out.println(mul);
  } catch (Exception e) {
  System.err.println("ComputePi exception: " + e.getMessage());
  e.printStackTrace();}
 }    
}