import java.io.*;
import java.net.*;
public class Server{
  public static void main(String argumendid[]) throws IOException{
      int a,b,c;
      
      ServerSocket ss=new ServerSocket(13);
          while(true){
            Socket sc=ss.accept();
            PrintWriter valja=new PrintWriter(sc.getOutputStream(), true);
            BufferedReader sisse=new BufferedReader(
                   new InputStreamReader(sc.getInputStream())
            );
            c=0;
            for(int q=1;q<=5;q++){
                a=(int)(10*Math.random());
                b=(int)(10*Math.random());
                valja.println("Skolko budet "+a+"+"+b+" ?");
                String nimi=sisse.readLine();
                valja.println("Vash otvet "+nimi);
                if(nimi.equals(""+(a+b))){c=c+1;}
              }
            valja.println("Vasha ocenka "+c);
            valja.println("End of session.");
           }
          }
       }