diff --git a/FKGees/DocsDefinitions/Decrets/Przecena.cs b/FKGees/DocsDefinitions/Decrets/Przecena.cs
index 20414e3..c847277 100644
--- a/FKGees/DocsDefinitions/Decrets/Przecena.cs
+++ b/FKGees/DocsDefinitions/Decrets/Przecena.cs
@@ -40,17 +40,12 @@ public class Przecena : IDecretsDefinition
 
     private decimal Processvalue(Dok doc, string expression)
     {
-        switch(expression)
+        return expression switch
         {
-            case "[snr]-[znr]":
-                return doc.Netto - doc.NettoDet;
-            case "[sbr]-[snr]":
-                return doc.Podatek - doc.PodatekDet;
-            case "[sbr]":
-                return doc.Razem;
-            
-        }
-
-        return 0;
+            "[snr]-[znr]" => doc.Netto - doc.NettoDet,
+            "[sbr]-[snr]" => doc.Podatek - doc.PodatekDet,
+            "[sbr]" => doc.Razem,
+            _ => 0
+        };
     }
 }
\ No newline at end of file
diff --git a/FKGees/DocsDefinitions/Decrets/Rozb.cs b/FKGees/DocsDefinitions/Decrets/Rozb.cs
index 44b7568..4bf00fc 100644
--- a/FKGees/DocsDefinitions/Decrets/Rozb.cs
+++ b/FKGees/DocsDefinitions/Decrets/Rozb.cs
@@ -53,24 +53,17 @@ public class Rozb : IDecretsDefinition
         return Task.FromResult(result);
     }
 
-    private decimal Processvalue(Dok doc, string expression)
+    private static decimal Processvalue(Dok doc, string expression)
     {
-        switch (expression)
+        return expression switch
         {
-            case "[znr]":
-                return -doc.Netto;
-            case "[zvr]":
-                return -doc.Podatek;
-            case "[zbr]":
-                return -(doc.Netto + doc.Podatek);
-            case "[sbr]":
-                return doc.NettoDet + doc.PodatekDet;
-            case "[svr]":
-                return doc.PodatekDet;
-            case "[sbr]-[snr]":
-                return doc.NettoDet + doc.PodatekDet - doc.Netto;
-        }
-
-        return 0;
+            "[znr]" => doc.Netto,
+            "[zvr]" => doc.Podatek,
+            "[zbr]" => (doc.Netto + doc.Podatek),
+            "[sbr]" => doc.NettoDet + doc.PodatekDet,
+            "[svr]" => doc.PodatekDet,
+            "[sbr]-[znr]" => doc.NettoDet + doc.PodatekDet - doc.Netto,
+            _ => 0
+        };
     }
 }
\ No newline at end of file
diff --git a/FKGees/DocsDefinitions/Decrets/Zwroty.cs b/FKGees/DocsDefinitions/Decrets/Zwroty.cs
index 593de7a..8b2e4d7 100644
--- a/FKGees/DocsDefinitions/Decrets/Zwroty.cs
+++ b/FKGees/DocsDefinitions/Decrets/Zwroty.cs
@@ -53,24 +53,17 @@ public class Zwroty : IDecretsDefinition
         return Task.FromResult(result);
     }
 
-    private decimal Processvalue(Dok doc, string expression)
+    private static decimal Processvalue(Dok doc, string expression)
     {
-        switch (expression)
+        return expression switch
         {
-            case "[znr]":
-                return -doc.Netto;
-            case "[zvr]":
-                return -doc.Podatek;
-            case "[zbr]":
-                return -(doc.Netto + doc.Podatek);
-            case "[sbr]":
-                return doc.NettoDet + doc.PodatekDet;
-            case "[svr]":
-                return doc.PodatekDet;
-            case "[sbr]-[snr]":
-                return doc.NettoDet + doc.PodatekDet - doc.Netto;
-        }
-
-        return 0;
+            "[znr]" => doc.Netto,
+            "[zvr]" => doc.Podatek,
+            "[zbr]" => doc.Netto + doc.Podatek,
+            "[sbr]" => doc.NettoDet + doc.PodatekDet,
+            "[svr]" => doc.PodatekDet,
+            "[sbr]-[znr]" => doc.NettoDet + doc.PodatekDet - doc.Netto,
+            _ => 0
+        };
     }
 }
\ No newline at end of file