How to refer to a workflow or activity input in Elsa designer Switch activity

[jirimatejka]

I have a Switch activity in the workflow definition. How can I write the conditions (cases) to work with worfklow inputs.

Example: There is an "Amount" input of integer type that is passed onto a workflow. In the Switch activity I need to decide wheter the Amount is grater than 500 or lower and make two brances based on that.

I suppose to use C# syntax (as there is no other option if the Type dropdown). It is clear, but how can I refer to a workflow input? Or possibly an Activity Input?

thanks

Jiri