diff --git a/problem_1.py b/problem_1.py
index 1533d9d..5772ab2 100644
--- a/problem_1.py
+++ b/problem_1.py
@@ -4,8 +4,8 @@
 
 sum=0
 
-for i in range(1,1000):
-    if i%3==0 or i%5==0:        
-        sum+=i
+for k in range(1,1000):
+    if k%3==0 or k%5==0:        
+        sum+=k
 
 print sum