import java.io.*;
import java.net.*;
class TaxServer {

	public static void main(String[] args) throws IOException {
		Server server = new Server();
		server.start();
		Client client = new Client("127.0.0.1");
		client = new Client("127.0.0.1");
		client = new Client("127.0.0.1");
	}
}



class Server extends Thread {
	public static final int PORT = 2357;
	ServerSocket serversock;

	Server() throws IOException {
		serversock = new ServerSocket(PORT);
	}

	public void run() {
		int services = 0;
		while(services++ < 3) {
			try {
				Socket sock = serversock.accept();
				DataInputStream dis = new DataInputStream(sock.getInputStream());
				DataOutputStream dos =  new DataOutputStream(sock.getOutputStream());
				int salery = dis.readInt();
				dos.writeInt( (int) (salery * Math.random())); // always return 0% tax.. yes that's my dream!
				dis.close();
				dos.close();
			}
			catch(IOException e) {System.err.println(e); }
		}
	}
}

class Client {
	Client(String url) throws IOException {
		Socket sock = new Socket(url, Server.PORT);
		DataOutputStream dos = new DataOutputStream(sock.getOutputStream());
		DataInputStream dis = new DataInputStream(sock.getInputStream());
		int salery = (int) (Math.random()*100000);
		dos.writeInt(salery);
		System.out.println("with a salery of " + salery + " you must pay " + dis.readInt() + " tax");
		dos.close();
		dis.close();
	}
}