import java.net.*;
import java.io.*;
public class  server
{
	public static void main(String args[]) throws Exception
	{
		ServerSocket ss=new ServerSocket(2000);
		Socket s=ss.accept();
		BufferedReader br=new BufferedReader(newInputStreamReader(s.getInputStream()));
		double rad,area;
		String result;
		rad=Double.parseDouble(br.readLine());
		System.out.println("From Client : "+rad);
		area=Math.PI*rad*rad;
		result="Area is "+area;	
		PrintStream ps=new PrintStream(s.getOutputStream());
		ps.println(result);
		br.close();
		ps.close();
		s.close();
		ss.close();
	}
}
public class  client
{
	public static void main(String args[]) throws Exception
	{
 
		Socket s=new Socket("192.168.0.19",2000);
		BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		String rad;
		System.out.println("Enter radius of the circle ");
		rad=br.readLine();
		PrintStream ps=new PrintStream(s.getOutputStream());
		ps.println(rad);
		BufferedReader fs=newBufferedReader(new InputStreamReader(s.getInputStream()));
		String result=fs.readLine();
		System.out.println("From Server : "+result);
		br.close();
		fs.close();	
		ps.close();
		s.close();
	}
}