diff --git a/ComputersShop/ComputersShopBusinessLogic/BusinessLogics/ShopLogic.cs b/ComputersShop/ComputersShopBusinessLogic/BusinessLogics/ShopLogic.cs
index 42f57b9..0c019ff 100644
--- a/ComputersShop/ComputersShopBusinessLogic/BusinessLogics/ShopLogic.cs
+++ b/ComputersShop/ComputersShopBusinessLogic/BusinessLogics/ShopLogic.cs
@@ -33,7 +33,7 @@ namespace ComputersShopBusinessLogic.BusinessLogics
             if (quantity <= 0)
             {
                 return false;
-                throw new ArgumentException("Количество добавляемого изделия должно быть больше 0", nameof(quantity));
+                throw new ArgumentException("Количество добавляемого компьютера должно быть больше 0", nameof(quantity));
             }
 
             _logger.LogInformation("AddComputerInShop. ShopName:{ShopName}.Id:{ Id}", model.ShopName, model.Id);
@@ -81,7 +81,7 @@ namespace ComputersShopBusinessLogic.BusinessLogics
             }
             if (quantity <= 0)
             {
-                throw new ArgumentException("Количество документов должно быть больше 0", nameof(quantity));
+                throw new ArgumentException("Количество компьютеров должно быть больше 0", nameof(quantity));
             }
             _logger.LogInformation("AddComputers. ShopName:{ShopName}. Id:{Id}", computer.ComputerName, computer.Id);
             var allFreeQuantity = _shopStorage.GetFullList().Select(x => x.Capacity - x.Computers.Select(x => x.Value.Item2).Sum()).Sum();
diff --git a/ComputersShop/ComputersShopFileImplement/Implements/ShopStorage.cs b/ComputersShop/ComputersShopFileImplement/Implements/ShopStorage.cs
index 2251118..8825bad 100644
--- a/ComputersShop/ComputersShopFileImplement/Implements/ShopStorage.cs
+++ b/ComputersShop/ComputersShopFileImplement/Implements/ShopStorage.cs
@@ -74,17 +74,13 @@ namespace ComputersShopFileImplement.Implements
 
         public bool SellComputers(IComputerModel model, int quantity)
         {
-            int hasCount = 0;
+            int hasCount = source.Shops
+            .SelectMany(x => x.Computers)
+            .Where(pair => pair.Key == model.Id)
+            .Sum(pair => pair.Value.Item2);
 
-            source.Shops.ForEach(x =>
-            {
-                if (x.Computers.TryGetValue(model.Id, out var pair))
-                {
-                    hasCount += pair.Item2;
-                }
-            });
-
-            if (hasCount < quantity) return false;
+            if (hasCount < quantity)
+                return false;
 
             source.Shops.ForEach(x =>
             {