diff --git a/testing_project/logistic.py b/testing_project/logistic.py
index e49d1c2..1afaa23 100644
--- a/testing_project/logistic.py
+++ b/testing_project/logistic.py
@@ -1 +1,3 @@
-# Your code goes here
+
+def f(x, r):
+    return r * x * (1-x)