Apply suggestion from @cclauss

Author: cclauss

maths/least_common_multiple.py

@@ -45,7 +45,7 @@ def least_common_multiple_fast(first_num: int, second_num: int) -> int:
     >>> least_common_multiple_fast(0, 0)
     0
     """
-    if first_num == 0 or second_num == 0:
+    if 0 in {first_num, second_num}:
         return 0
     return first_num // greatest_common_divisor(first_num, second_num) * second_num