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

public class randoms
{

static final int rport = 1917;

public static void main(String[] args)
{
 try
 { ServerSocket listener;
   System.out.println("\nRandom number server started on port "+ rport);
   while (true)
   { Socket mysocket;
     listener = new ServerSocket(rport);
     mysocket = listener.accept();  // passive open;
     //  System.out.println("randoms: client socket connected");
     randomthread rt = new randomthread(mysocket);
     rt.start();   // starts thread
     listener.close();
   } // end infinite while
} catch (Exception E) { System.out.println(E); }
}  // end main

} // end class randoms


class randomthread extends Thread
{  Socket mysocket;
   public randomthread(Socket s)
    { super();  mysocket = s; }
  
 public void run()
  { 
    int range;
    int r;
    String instring = "dd";
    try
    {
      OutputStreamWriter osw = 
	new OutputStreamWriter(mysocket.getOutputStream());
      PrintWriter sender = new PrintWriter(osw,true);
      BufferedReader receiver = 
	  new BufferedReader(new InputStreamReader(mysocket.getInputStream()));
      do
       {
	   instring = receiver.readLine();
           if (instring.equals("bye")) break;
	   range = Integer.parseInt(instring);
	   r = (int) (Math.random() * range);
	   sender.println("" + r + ".");
	   //	   sender.print("" + r + "." + ((char) 0));
       }
      while (!(instring.equals("bye")));

      mysocket.close();
    } catch (Exception E) { System.out.println(E); }

  } // end run
}  // end class randomthread