diff --git a/java/search/BinarySearch3637.java b/java/search/BinarySearch3637.java
index 70477e6..d616c9b 100644
--- a/java/search/BinarySearch3637.java
+++ b/java/search/BinarySearch3637.java
@@ -17,7 +17,11 @@ public class BinarySearch3637 {
 
         int start = searchIterativeDecreasing(x, a);
         int end = searchIterativeIncreasing(x, a.getReversed());
-        System.out.println(((end - start) == -1) ? 0 : (end - start));
+        if (a.get(start) != x) {
+            System.out.println(0);
+        } else {
+            System.out.println(end - start);
+        }
     }
 
     static int searchIterativeIncreasing(int x, IntList a) {