diff --git a/lab2/src/main/java/ru/spbstu/telematics/java/App.java b/lab2/src/main/java/ru/spbstu/telematics/java/App.java
index 146e6f7..175d192 100644
--- a/lab2/src/main/java/ru/spbstu/telematics/java/App.java
+++ b/lab2/src/main/java/ru/spbstu/telematics/java/App.java
@@ -1,13 +1,12 @@
 package ru.spbstu.telematics.java;
 
-/**
- * Hello world!
- *
- */
 public class App 
 {
     public static void main( String[] args )
     {
-        System.out.println( "Hello World!" );
+        MyTreeSet<Integer> tree = new MyTreeSet<>();
+        tree.add(10);
+        tree.add(20);
+        tree.add(5);
     }
 }
diff --git a/lab2/src/main/java/ru/spbstu/telematics/java/MyTreeSet.java b/lab2/src/main/java/ru/spbstu/telematics/java/MyTreeSet.java
index df7b78e..768aee6 100644
--- a/lab2/src/main/java/ru/spbstu/telematics/java/MyTreeSet.java
+++ b/lab2/src/main/java/ru/spbstu/telematics/java/MyTreeSet.java
@@ -18,4 +18,31 @@ public class MyTreeSet<E extends Comparable<E>> {
     public MyTreeSet() {
         root = null;
     }
+
+    public void add(E element) {
+        if (root == null) {
+            root = new Node(element);
+            return;
+        }
+
+        Node currentNode = root;
+        Node parentNode = null;
+
+        while (currentNode != null) {
+            int cmp = element.compareTo(currentNode.value);
+            if (cmp == 0) {
+                return;
+            } 
+            parentNode = currentNode;
+            currentNode = cmp < 0 ? currentNode.left : currentNode.right;
+        }
+
+        Node newNode = new Node(element);
+        
+        if (element.compareTo(parentNode.value) < 0) {
+            parentNode.left = newNode;
+        } else {
+            parentNode.right = newNode;
+        }
+    }
 }