Prime Programming help needed for a (still) newb Prime user

[C.Ret]

Hello,

To use my HP prime as a simple counter, I never made something so elaborate.

In HOME or CAS view, I press [ 0 ] [ ENTER ] to enter zero in the results stack.
Then I press [ Shift ][ Ans ] [ + ] [ 1 ] [ENTER] to initiate increment by one.
Then any further press on [ ENTER ] increase the “counter” one more unit.

If you whish, you can program the "Ans+1"; sequence on a specific User key to spare a few keystrokes.