diff --git a/collatz-conjecture/collatz_conjecture.py b/collatz-conjecture/collatz_conjecture.py
index 1740424..ee7a1aa 100644
--- a/collatz-conjecture/collatz_conjecture.py
+++ b/collatz-conjecture/collatz_conjecture.py
@@ -1,2 +1,11 @@
 def steps(number):
-    pass
+    if number <= 0:
+        raise ValueError("Only positive integers are allowed")
+    count = 0
+    while number != 1:
+        if number % 2 == 0:
+            number = number / 2
+        else:
+            number = number * 3 + 1
+        count += 1
+    return count