diff --git a/lib/string_calculator.dart b/lib/string_calculator.dart
index bb7e714..763c5b6 100644
--- a/lib/string_calculator.dart
+++ b/lib/string_calculator.dart
@@ -17,7 +17,7 @@ class StringCalculator {
 
     // Bug 2: Single number parsing
     if (!numbers.contains(',') && !numbers.contains('\n') && !numbers.startsWith('//')) {
-      return int.parse(numbers) + 1; // Off by one error
+      return int.parse(numbers); // Fixed: Removed off-by-one error
     }
 
     String delimiter = ',';