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diff --git a/challenge-046/paulo-custodio/python/ch-2.py b/challenge-046/paulo-custodio/python/ch-2.py
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+#!/usr/bin/env python3
+
+# Challenge 046
+#
+# TASK #2
+# Is the room open?
+# There are 500 rooms in a hotel with 500 employees having keys to all the rooms.
+# The first employee opened main entrance door of all the rooms. The second
+# employee then closed the doors of room numbers 2,4,6,8,10 and so on to 500. The
+# third employee then closed the door if it was opened or opened the door if it
+# was closed of rooms 3,6,9,12,15 and so on to 500. Similarly the fourth employee
+# did the same as the third but only room numbers 4,8,12,16 and so on to 500.
+# This goes on until all employees has had a turn.
+#
+# Write a script to find out all the rooms still open at the end.
+
+locked = [True for x in range(501)]
+for emp in range(1, 501):
+    for room in range(emp, 501, emp):
+        locked[room] = not locked[room]
+rooms_open = []
+for room in range(1, 501):
+    if not locked[room]:
+        rooms_open.append(room)
+print(", ".join([str(x) for x in rooms_open]))