diff --git a/src/main/java/ru/mcs/udk/UdkSiteParser.java b/src/main/java/ru/mcs/udk/UdkSiteParser.java
index 22d8aed..73d2aff 100644
--- a/src/main/java/ru/mcs/udk/UdkSiteParser.java
+++ b/src/main/java/ru/mcs/udk/UdkSiteParser.java
@@ -1,39 +1,59 @@
 package ru.mcs.udk;
 
-import com.fasterxml.jackson.databind.ObjectMapper;
 import org.jsoup.Jsoup;
 import org.jsoup.nodes.Element;
 import org.jsoup.select.Elements;
 
-import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
+import java.io.IOException;
 import java.io.PrintStream;
 import java.nio.charset.StandardCharsets;
 
 public class UdkSiteParser {
-    public static void main(String[] args) throws InterruptedException, FileNotFoundException {
+
+    public static final String HTTPS_WWW_TEACODE_COM_ONLINE_UDC = "https://www.teacode.com/online/udc";
+
+    public static void main(String[] args) throws IOException {
         System.setOut(new PrintStream(new FileOutputStream("out.txt"), true, StandardCharsets.UTF_8));
 
-        ObjectMapper objectMapper = new ObjectMapper();
+        getHierarchy(HTTPS_WWW_TEACODE_COM_ONLINE_UDC, 0, 1000);
+
+    }
+
+    public static void getHierarchy(String url, int level, int stopLevel) {
         try {
-            var document = Jsoup.connect("https://www.teacode.com/online/udc/")
-                    .timeout(10000)
+            var document = Jsoup.connect(url)
+                    .timeout(5000)
                     .followRedirects(true)
                     .userAgent("Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:25.0) Gecko/20100101 Firefox/25.0")
                     .execute().parse();
 
-            Elements one = document.select("table tr[bgcolor=#eaeaea] td:eq(0) a");
-            Elements two = document.select("table tr[bgcolor=#eaeaea] td:eq(1)[align=left]");
+            Elements rows = document.select("table tr[bgcolor=#eaeaea]");
 
-            if (one.size() == two.size()) {
-                for (int i = 0; i < one.size(); i++) {
-                    Element udkNumber = one.get(i);
-                    Element udkText = two.get(i);
-                    System.out.printf("%s\t%s%n", udkNumber.text(), udkText.text());
+            // тут создаем новую переменную которую будем передавать в метод
+            int nextLevel = level + 1;
+            for (Element row : rows) {
+                Elements udkNumber = row.select("td:eq(0)");
+                Elements udkTitle = row.select("td:eq(1)[align=left]");
+                System.out.printf("%s%s\t%s%n", "\t".repeat(Math.max(0, level)), udkNumber.text(), udkTitle.text());
+
+                String pageUrl = udkNumber.select("a").attr("href");
+                if (!pageUrl.isEmpty() && level <= stopLevel) {
+                    String subUrl = getUrl(url, pageUrl);
+
+                    getHierarchy(subUrl, nextLevel, stopLevel);
                 }
             }
         } catch (Exception ex) {
             System.out.println(ex.getMessage());
         }
     }
+
+    private static String getUrl(String url, String subUrl) {
+        if (subUrl.startsWith(".")) {
+            return String.format("%s%s", HTTPS_WWW_TEACODE_COM_ONLINE_UDC, subUrl.replaceFirst(".", ""));
+        } else {
+            return String.format("%s%s", url.replaceAll("/[^/]+\\.html$", "/"), subUrl);
+        }
+    }
 }