diff --git a/ball_in_box/area_sum.py b/ball_in_box/area_sum.py
index 67ad6df..4c548b8 100644
--- a/ball_in_box/area_sum.py
+++ b/ball_in_box/area_sum.py
@@ -1,27 +1,35 @@
 import math
+
 import ball_in_box.ballinbox as bb
 import ball_in_box.validate as val
 
+import time
+
+
 def area_sum(circles):
     area = 0.0
     for circle in circles:
-        area += circle[2]**2 * math.pi
+        area += circle[2] ** 2 * math.pi
 
     return area
 
+
 if __name__ == '__main__':
     num_of_circle = 5
     blockers = [(0.5, 0.5)
-               ,(0.5, -0.3)]
-    
+        , (0.5, -0.3)]
+
+    begin = time.time()
+
     circles = bb.ball_in_box(num_of_circle, blockers)
-    
+
+    area = 0
+
     if num_of_circle == len(circles) and val.validate(circles, blockers):
+
         area = area_sum(circles)
         print("Total area: {}".format(area))
     else:
         print("Error: no good circles.")
 
-
-
-
+    # print("Time:", time.time() - begin)