import java.io.*;
import java.net.*;
import java.util.Scanner;

public class MathServer extends Server
{
    public MathServer(int port)
    {
	super(port);
    }


    /* This is the main method for the Server */
    public static void main(String[] args)
    {
	if (args.length < 1)
	{
	    System.out.println("Please specify a port number!");
	    System.exit(0);
	}

	int port = Integer.parseInt(args[0]);

	MathServer ms = new MathServer(port);

	ms.run();
    }


    public void run()
    {
	try
	{
	    // wait for a client
	    Socket socket = server.accept();

	    System.out.println("Connection established");
	    
	    // get the input stream
	    in = new Scanner(socket.getInputStream());
	    
	    // get the output stream
	    out = new PrintWriter(socket.getOutputStream());
		

	    // keep running until you get an exception
	    while(true)
	    {		
		// read the next line
		int value = in.nextInt();
		
		// echo it out
		System.out.println(":" + value + ":");
		
		// square it
		long sq = value * value;
		
		// write to the output stream
		out.write(sq + "\n");
		out.flush();
	    }
        }
	// this will catch ANY exception that occurs
	catch (Exception e)
	{
	    //e.printStackTrace();
	    System.out.println("Server stopped.");
	}
	// make sure you close the ServerSocket when you're done!
	finally
	{
	    shutdown();
	}
    }


}