diff --git a/MainWindow.xaml.cs b/MainWindow.xaml.cs
index 5c0db40..161a8be 100644
--- a/MainWindow.xaml.cs
+++ b/MainWindow.xaml.cs
@@ -105,11 +105,10 @@ namespace SUNLIGHT_CDKEY
 
         private void Button_Click(object sender, RoutedEventArgs e)
         {
-            string a,b;
+            string a, b;
 
-            a = sn_id.Text.Substring(0, 6);
-
-            b = (255-y).ToString()+ (255 - m).ToString()+(255 - d).ToString();
+            a= sn_id.Text.Substring(0, 6);
+            b=(2255-y).ToString()+(255-m).ToString()+(255-d).ToString();
 
             cdk.Text = a + b + CRCcheck16.ToCRC16(CRCcheck16.StringToHexByte(b), true);
         }