diff --git a/module5/src/main/java/com/hithomelabs/princeton1/module5/Shell.java b/module5/src/main/java/com/hithomelabs/princeton1/module5/Shell.java
index 7abc6fd..a7f23e0 100644
--- a/module5/src/main/java/com/hithomelabs/princeton1/module5/Shell.java
+++ b/module5/src/main/java/com/hithomelabs/princeton1/module5/Shell.java
@@ -25,9 +25,16 @@ public class Shell<E> extends AbstractCustomSorts<E> {
     @Override
     public void sort(E[] arr) {
         Insertion<E> sortingAlgorithm = new Insertion<>();
-        sortingAlgorithm.sort(arr, 7);
-        sortingAlgorithm.sort(arr, 3);
-        sortingAlgorithm.sort(arr);
+
+        int h=1, N=arr.length;
+        while(h < N/3)
+            h = 3*h + 1;
+
+        while( h >= 1){
+            sortingAlgorithm.sort(arr, h);
+            h=h/3;
+        }
+
     }
 
     private int hsort(E[] arr, int h, MetaData metadata) {