diff --git a/Week04/decorators_alisher_shalenov.py b/Week04/decorators_alisher_shalenov.py
new file mode 100644
index 00000000..7373797a
--- /dev/null
+++ b/Week04/decorators_alisher_shalenov.py
@@ -0,0 +1,26 @@
+import time
+import tracemalloc
+
+
+def performance(fn):
+    def _inner(*args, **kwargs):
+        tracemalloc.start()
+        begin = time.time()
+        output = fn(*args, **kwargs)
+        end = time.time()
+        used = tracemalloc.get_traced_memory()[1]
+        tracemalloc.stop()
+
+        setattr(performance, "counter", getattr(performance, "counter", 0) + 1)
+        setattr(performance, "total_time", getattr(performance, "total_time", 0) + (end - begin))
+        setattr(performance, "total_mem", getattr(performance, "total_mem", 0) + used)
+        return output
+
+    _inner.__name__ = fn.__name__
+    _inner.__doc__ = fn.__doc__
+    return _inner
+
+
+performance.counter = 0
+performance.total_time = 0
+performance.total_mem = 0