diff --git a/src/parent_selection/parent_selection_methods.py b/src/parent_selection/parent_selection_methods.py
index fc2396a..5b33577 100644
--- a/src/parent_selection/parent_selection_methods.py
+++ b/src/parent_selection/parent_selection_methods.py
@@ -153,8 +153,8 @@ class Parent_Selection:
             # etc.
             # with an inflation of (1-selection probability) * sum of weights
 
-            sum_of_weights = round(len(ga.population) * (len(ga.population)+1) / 2)
-            inflation = (1-ga.selection_probability) * sum_of_weights
+            average_weight = (len(ga.population)+1) // 2
+            inflation = (1-ga.selection_probability) * average_weight
 
             weights = [
                 i + inflation