import java.io.DataInputStream;

import java.io.DataOutputStream;

import java.io.InputStream;

import java.io.OutputStream;

import java.net.Socket;

class SquareClient {

  private final static int BUFSIZE = 20;

  public static void main(String args[]) throws Exception {

    String server = args[0];

    int port = Integer.parseInt(args[1]);

    double value = Double.valueOf(args[2]).doubleValue();

    Socket s = new Socket(server, port);

    OutputStream os = s.getOutputStream();

    DataOutputStream dos = new DataOutputStream(os);

    dos.writeDouble(value);

    InputStream is = s.getInputStream();

    DataInputStream dis = new DataInputStream(is);

    value = dis.readDouble();

    System.out.println(value);

    s.close();

  }

}