diff --git a/logistic.py b/logistic.py
index e49d1c2..da2f799 100644
--- a/logistic.py
+++ b/logistic.py
@@ -1 +1,8 @@
 # Your code goes here
+def f(x,r):
+    return r * x * (1-x) 
+
+def iterate_f(x,r,it):
+    result = []
+    for _ in range(it):
+        result.append(f(result[-1],r))
\ No newline at end of file
diff --git a/test_logistic.py b/test_logistic.py
index 9391bee..f64831f 100644
--- a/test_logistic.py
+++ b/test_logistic.py
@@ -1,5 +1,5 @@
 from numpy.testing import assert_allclose
-
+import pytest
 from logistic import f
 
 # Add here your test for the logistic map
@@ -14,3 +14,14 @@ def test_f_corner_cases():
     for x, r, expected in cases:
         result = f(x, r)
         assert_allclose(result, expected)
+
+
+
+@pytest.mark.parametrize('x, r, expected', [ 
+        (0.1,2.2,0.198),
+        (0.2,3.4,0.544),
+        (0.5,2,0.5)
+    ])
+def test_f_generic_values(x,r,expected):
+    result = f(x, r)
+    assert_allclose(result, expected)
\ No newline at end of file