diff --git a/e2/e2.rb b/e2/e2.rb
index 104846a..78c779b 100755
--- a/e2/e2.rb
+++ b/e2/e2.rb
@@ -7,10 +7,7 @@ def sum(last, current, sum)
 	if current % 2 == 0
 		sum += current
 	end
-	tmp = current
-	current += last
-	last = tmp
-	sum(last, current, sum)
+	sum(current,last+ current, sum)
 end
 
 puts sum(0, 1, 0)