diff --git a/bounded-contexts/java/src/main/java/p1/myshop/entities/Quantity.java b/bounded-contexts/java/src/main/java/p1/myshop/entities/Quantity.java
index 63e5d71..87a98e9 100644
--- a/bounded-contexts/java/src/main/java/p1/myshop/entities/Quantity.java
+++ b/bounded-contexts/java/src/main/java/p1/myshop/entities/Quantity.java
@@ -1,4 +1,14 @@
 package p1.myshop.entities;
 
 public class Quantity {
+
+    int value;
+
+    Quantity(int value) {
+        this.value = value;
+    }
+
+    public int toInt() {
+        return value;
+    }
 }
diff --git a/bounded-contexts/java/src/main/java/p1/myshop/services/shipping/DeliveryService.java b/bounded-contexts/java/src/main/java/p1/myshop/services/shipping/DeliveryService.java
index afb1116..3607b8a 100644
--- a/bounded-contexts/java/src/main/java/p1/myshop/services/shipping/DeliveryService.java
+++ b/bounded-contexts/java/src/main/java/p1/myshop/services/shipping/DeliveryService.java
@@ -14,9 +14,7 @@ public DeliveryService(CatalogService catalogService) {
 
     public double calculateOrderWeight(Cart cart) {
         return cart.items().stream()
-                .map(CartItem::itemId)
-                .map(catalogService::loadItem)
-                .mapToDouble(HasWeight::weight)
+                .mapToDouble(cartItem -> cartItem.quantity.toInt() * catalogService.loadItem(cartItem.itemId).weight())
                 .sum();
     }
 }