diff --git a/anikinvd/docs/data/1-st-exercise/phonebook.py b/anikinvd/docs/data/1-st-exercise/phonebook.py
index 3480c11..7be0727 100644
--- a/anikinvd/docs/data/1-st-exercise/phonebook.py
+++ b/anikinvd/docs/data/1-st-exercise/phonebook.py
@@ -1,3 +1,10 @@
+import random
+import time
+import csv
+import sys
+
+sys.setrecursionlimit(20000)
+
 
 def llist_insert(head, name, phone):
     current = head
@@ -150,14 +157,118 @@ def bst_get_all(root):
     return result
 
 
+def generate_phonebook_entries(n, seed=42):
+    random.seed(seed)
+    records = []
+    for i in range(1, n + 1):
+        name = f"User_{i:05d}"
+        phone = f"{random.randint(100,999)}-{random.randint(1000,9999)}"
+        records.append((name, phone))
+    return records
+
+
+def prepare_datasets(base_records):
+    shuffled = base_records.copy()
+    random.shuffle(shuffled)
+    sorted_records = sorted(base_records, key=lambda x: x[0])
+    return shuffled, sorted_records
+
+
+def run_experiment(struct_funcs, records, mode_name, repeats=5):
+    all_results = []
+    for rep in range(repeats):
+        struct = struct_funcs['create']()
+
+        start = time.perf_counter()
+        for name, phone in records:
+            struct = struct_funcs['insert'](struct, name, phone)
+        insert_time = time.perf_counter() - start
+
+        existing_names = [name for name, _ in records]
+        sample_existing = random.sample(existing_names, 100)
+        nonexistent = [f"None_{i}" for i in range(10)]
+        search_names = sample_existing + nonexistent
+        random.shuffle(search_names)
+
+        start = time.perf_counter()
+        for name in search_names:
+            _ = struct_funcs['find'](struct, name)
+        find_time = time.perf_counter() - start
+
+        to_delete = random.sample(existing_names, 50)
+        start = time.perf_counter()
+        for name in to_delete:
+            struct = struct_funcs['delete'](struct, name)
+        delete_time = time.perf_counter() - start
+
+        all_results.append({
+            'structure': struct_funcs['name'],
+            'mode': mode_name,
+            'repetition': rep + 1,
+            'insert_time': insert_time,
+            'find_time': find_time,
+            'delete_time': delete_time
+        })
+    return all_results
+
+
+def run_benchmark():
+    N = 10000
+    REPEATS = 5
+
+    base_records = generate_phonebook_entries(N)
+    shuffled_records, sorted_records = prepare_datasets(base_records)
+
+    structures = {
+        'LinkedList': {
+            'name': 'LinkedList',
+            'create': lambda: None,
+            'insert': llist_insert,
+            'find': llist_find,
+            'delete': llist_delete,
+            'get_all': llist_get_all
+        },
+        'HashTable': {
+            'name': 'HashTable',
+            'create': ht_create,
+            'insert': ht_insert,
+            'find': ht_find,
+            'delete': ht_delete,
+            'get_all': ht_get_all
+        },
+        'BST': {
+            'name': 'BST',
+            'create': lambda: None,
+            'insert': bst_insert,
+            'find': bst_find,
+            'delete': bst_delete,
+            'get_all': bst_get_all
+        }
+    }
+
+    all_results = []
+
+    for struct_name, funcs in structures.items():
+        results_random = run_experiment(funcs, shuffled_records, 'random', REPEATS)
+        all_results.extend(results_random)
+        results_sorted = run_experiment(funcs, sorted_records, 'sorted', REPEATS)
+        all_results.extend(results_sorted)
+
+    with open('experiment_results.csv', 'w', newline='', encoding='utf-8') as f:
+        writer = csv.writer(f)
+        writer.writerow(['Structure', 'Mode', 'Repeat', 'Insert (sec)', 'Search (sec)', 'Delete (sec)'])
+        for r in all_results:
+            writer.writerow([
+                r['structure'],
+                r['mode'],
+                r['repetition'],
+                f"{r['insert_time']:.6f}",
+                f"{r['find_time']:.6f}",
+                f"{r['delete_time']:.6f}"
+            ])
+
+    print("Experiment finished. Results saved to 'experiment_results.csv'.")
+
+
 if __name__ == '__main__':
-    root = None
-    root = bst_insert(root, "Charlie", "111-111")
-    root = bst_insert(root, "Alice", "222-222")
-    root = bst_insert(root, "Bob", "333-333")
-    root = bst_insert(root, "Alice", "444-444")
-    print(bst_find(root, "Alice"))
-    print(bst_find(root, "Bob"))
-    print(bst_get_all(root))
-    root = bst_delete(root, "Bob")
-    print(bst_get_all(root))
\ No newline at end of file
+    run_benchmark()
\ No newline at end of file