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

public class LocalPortScanner{
	public static void main(String[] args){
		boolean blean = false;
		for (int port = 1; port < 500; port+=50) {
			try {
				ServerSocket server = new ServerSocket(port);
				System.out.println(server);
				blean= true;
				server.close();
			}
			catch (UnknownHostException e) {
				System.err.println(e);
			}
			catch (IOException ex){
				System.out.println("socket address not found");
			}
		}
	}
}