diff --git a/t01primeshcflcm_hcf1.py b/t01primeshcflcm_hcf1.py
index 7ea02a8..2dc9e37 100644
--- a/t01primeshcflcm_hcf1.py
+++ b/t01primeshcflcm_hcf1.py
@@ -1,2 +1,8 @@
 # Find the Highest Common Factor (HCF) of 18 and 30.
 
+a = 18
+b = 30
+
+while b != 0:
+    (a, b) = (b, a % b)
+print(a)