diff --git a/src/main/java/resources/CalculatorResource.java b/src/main/java/resources/CalculatorResource.java
index b87c2a6bcf5715684e6bd84d5537f71dbddae0a8..2d4ee6c2eb36ed3c4a2e7c5cb819956b5bf98a1d 100644
--- a/src/main/java/resources/CalculatorResource.java
+++ b/src/main/java/resources/CalculatorResource.java
@@ -79,7 +79,7 @@ public class CalculatorResource {
             numbers[i] = Integer.parseInt(split[i]);
         }
 
-        int sum = split[0];
+        int sum = numbers[0];
         for(int i = 1; i < numbers.length; i++){
             sum -= numbers[i];
         }