import java.net.*;
import java.io.* ;

class Server{

  public static void main (String args[]) {

    ServerSocket Rendezvous ;
    Socket theConnection ;
    PrintWriter RemoteOutput ;

    int port = 5193 ;
    int visits = 0 ;

    if ( args.length >= 1) {
	try {
	    port = Integer.parseInt(args[0]) ;
	} catch (NumberFormatException nfe) {
	    port = -1 ;	// sure to fail
	}
    }

    try {
       Rendezvous = new ServerSocket(port) ;
       while (true) {
	   try {
	       theConnection = Rendezvous.accept() ;
	       RemoteOutput = new PrintWriter(theConnection.getOutputStream(),
					      true) ;
	       ++visits ;
	       RemoteOutput.println("This server has been contacted " + 
				    visits + " times.") ;
	       theConnection.close() ;
	   } catch ( IOException ioe ) {
	       System.out.println("Accept failed") ;
	       return ;
	   }
       } 
    } catch ( IOException ioe ) {
       System.out.println("Unable to open socket on port " + port) ;
    } catch ( IllegalArgumentException iae ) {	// inconsistent with docs
       System.out.println("bad port " + port) ;
    }

  }
}