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

public class Server {
    static int round = 1;
    static int msgnum = 5000;
    static long start = 0;
    static long end = 0;
    static int overhead = 0;
    static ServerSocket serverSocket = null;

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

	if (args.length != 1 ) return;
 	 msgnum = Integer.parseInt(args[0]);
	 //	 round = Integer.parseInt(args[1]); 
        try {
            serverSocket = new ServerSocket(4444);
        } catch (IOException e) {
            System.err.println("Could not listen on port: 4444.");
            System.exit(1);
        }
	//	int i = 0;
	//	 while(i++ < round)
	     test();
	 System.out.println("Average Time:" + overhead/round + " milliseconds");
        serverSocket.close();
	 
    }
    private static  void test() throws IOException{
	System.err.println("test start");
        Socket clientSocket = null;
        try {
            clientSocket = serverSocket.accept();
        } catch (IOException e) {
            System.err.println("Accept failed.");
            System.exit(1);
        }

	DataInputStream in = new DataInputStream(clientSocket.getInputStream());
        String inputLine;
	int msgcount = 0;

	while ((inputLine=in.readLine()) != null){
	    msgcount ++;
	    if(msgcount == 1) 	start = System.currentTimeMillis();
	    if (msgcount == msgnum) break;
	}
	end = System.currentTimeMillis();
	overhead += (end - start);
	in.close();
	clientSocket.close();
    }

}