private void Button_Click_Factorial(object sender, RoutedEventArgs e)
 {
     // Also factorial max out at 3500... Because anything higher breaks stuff (I.e. that loop down their loops many many many times. Also overflows so)
     if (CalcController.InputBoxIsNotEmpty(InputBox) && int.Parse(InputBox.Text) > 3500)
     {
         CalcController.OverwriteInput("NaN");
     }
     else if (CalcController.CanPlaceOperator())
     {
         CalcController.AddTextOperatorBox("", $"!({InputBox.Text})");
         CalcController.ClearInputBox();
     }
 }