import java.io.*;

import java.net.*;

import java.util.Scanner;

import java.net.ServerSocket;

import java.net.Socket;

class charu

{

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

{

ServerSocket ss=new ServerSocket(7777);

Socket s=ss.accept();

System.out.println("Connection Established");

PrintStream ps=new PrintStream(s.getOutputStream());

Scanner sc=new Scanner(s.getInputStream());

int a,b;

a=sc.nextInt();

b=a+a;

ps.println(b);

}

}

import java.io.*;

import java.net.*;

import java.util.Scanner;

import java.net.ServerSocket;

import java.net.Socket;

public class int2

{

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

{

Socket s= new Socket("127.0.0.1",7777);

int p;

System.out.println("enter value of p");

Scanner scanner = new Scanner(System.in);

p=scanner.nextInt();

PrintStream ps=new PrintStream(s.getOutputStream());

ps.println(p);

Scanner sc=new Scanner(s.getInputStream());

String str;

str=sc.next();

System.out.println(str);

}

}