diff --git a/lib/string_calculator.dart b/lib/string_calculator.dart
index 934878c..9f7bc8c 100644
--- a/lib/string_calculator.dart
+++ b/lib/string_calculator.dart
@@ -37,6 +37,7 @@ class StringCalculator {
         .split(delimiter)
         .where((s) => s.isNotEmpty)
         .map((s) => int.parse(s))
+        .where((n) => n <= 1000) // Filter out numbers > 1000
         .toList();
 
     // Bug 3: Off-by-one in summation