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+import java.io.IOException;
+import java.io.InputStream;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.io.OutputStream;
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+import java.net.InetAddress;
+import java.net.ServerSocket;
+import java.net.Socket;
+import java.net.SocketException;
+import java.util.ArrayList;
+import java.util.Collections;
+
+
+public class UdpSender extends Thread {
+
+     public static void main(String[] args) throws Exception {
+         
+         Socket tcpsocket = UDPReceiver();
+         // Muodostetaan oliovirrat
+         ObjectInputStream inpStream = new ObjectInputStream(tcpsocket.getInputStream());
+         ObjectOutputStream outpStream = new ObjectOutputStream(tcpsocket.getOutputStream());
+         //Lue  - asettaa timeoutin.
+         tcpsocket.setSoTimeout(50000);
+         int t= lue(inpStream, outpStream);
+         int[] potnumbers =new int[t];
+         int l = 0;
+         ArrayList<Integer> vastaanotetutsummat = new ArrayList<Integer>();
+         ArrayList<Socket> sok = new ArrayList<Socket>();
+         boolean yhteys=true;
+         int f= 0;
+        
+         if (t == -1) {
+         	return;
+         } else {
+        	 for (int h = 0; h < t; h++ ) {
+        		 try{
+        			 int p = 1234+h;
+        			 potnumbers[h]=p;
+        			 outpStream.writeInt(potnumbers[h]);
+        			 outpStream.flush();
+    
+        		 } catch (Exception e) {
+        			 System.out.print("moi");
+        			 return;
+        		 }
+        	 }
+         }
+         	
+         
+         for (int i = 0; i<t; i++) {
+             	int p = 1234+i;
+         		ServerSocket plib = new ServerSocket(p);
+				Socket so = new Socket();
+				so = plib.accept();
+				sok.add(i, so);
+				plib.setSoTimeout(5000);
+				plib.close();
+         
+    }
+
+          for (int k=0; k<t; k++) {
+        	 final LaskeLuvut laskuri= new LaskeLuvut(vastaanotetutsummat, k, sok);
+        	 laskuri.run();
+     		
+          }
+          System.out.println(vastaanotetutsummat);
+         
+         System.out.println("456");
+         
+         while(yhteys){
+        	 f=inpStream.readInt();
+        	 if (f==1){
+        		 int sum=0;
+        		 for (int j=0; j<vastaanotetutsummat.size(); j++) {
+        			 sum=sum+vastaanotetutsummat.get(j);}
+        		 outpStream.writeInt(sum);
+        	 }else if (f==2){
+        		 Collections.sort(vastaanotetutsummat);
+        		 outpStream.writeInt(vastaanotetutsummat.get(vastaanotetutsummat.size()-1));
+        	 }else if (f==3) {
+        		 outpStream.writeInt(l);
+        	 }else if (f==0) {
+        		 yhteys=false;
+        	 }
+         }
+     }
+     	 
+   
+ 		public static class LaskeLuvut{
+ 			private int k;
+ 			int l=0;
+ 			private ArrayList<Integer> vastaanotetutsummat;
+ 			private int z=0;
+ 			ArrayList<Socket> sok ;
+ 	
+ 			
+ 			LaskeLuvut(ArrayList<Integer> vastaanotetutsummat, int k,  ArrayList<Socket> sok){
+ 				this.sok=sok;
+ 				this.k=k;
+ 				this.vastaanotetutsummat=vastaanotetutsummat;
+ 						
+ 			}
+ 			public void run() {
+	 			try {
+	 					boolean c = true;
+	 					int q = 0;
+	            		InputStream uS = sok.get(k).getInputStream();
+	            		ObjectInputStream inStream = new ObjectInputStream(uS);
+	            		while (c) {  
+	            			if(inStream.readInt()==0) {
+	            				inStream.close();
+	            			} else {
+	            				q=q+inStream.readInt();
+	            				vastaanotetutsummat.add(z, k);
+	            				l++;
+	            		
+	
+	            			}
+	 				
+	            		}
+	            		inStream.close();
+	            		
+	 			}catch (Exception e) {
+ 				
+	 			}	
+ 			}	
+ 		}
+ 		
+
+	private static Socket UDPReceiver() throws IOException {
+		int porttiNo = 1234;
+		int yrityskerta = 0;
+		ServerSocket pleb = new ServerSocket(porttiNo);
+		Socket soketti = new Socket();
+		
+		while (yrityskerta < 5) {
+			try {
+				sendUDP(); // lähetetään UDP paketti asiakkaalle
+				pleb.setSoTimeout(50000); // soketti odottaa yhteydenottoa 5 sek
+				soketti = pleb.accept();
+				pleb.close();
+				System.out.println("TCP muodostettu");
+				System.out.println(soketti);
+				return soketti;
+			} catch (SocketException e) {
+				yrityskerta++;
+				System.out.println("Ei onnistunut");
+			}
+		} 
+		return null;
+	} 
+	private static void sendUDP() {
+		try {	
+			InetAddress targetAddress = InetAddress.getLoopbackAddress();
+	        DatagramSocket socket = new DatagramSocket(); //luo socketin vapaaseen porttiin paikallisessa koneessa
+	        byte[] data = Integer.toString(1234).getBytes();
+	        DatagramPacket packet = new DatagramPacket (data, data.length, targetAddress, 3126); //luo datagrampacketin
+	        socket.send(packet); // lähettää paketin
+	        socket.close();
+	    } catch (Exception e) {
+			e.printStackTrace();
+		}
+	}
+	
+	private static int lue(ObjectInputStream i, ObjectOutputStream o) {
+		try {
+			return i.readInt();
+		} catch (Exception e){
+			try {
+				o.writeInt(-1);
+			} catch (IOException e1) {
+				e1.printStackTrace();
+			}
+			return -1;
+		}
+		
+		
+	}}