How to create a step with multiple final values in different instants?

Hi,

I need a block similar to the step to use on simulink but I need one, which gives me final values at different instants. For example:

Initial value = 0 Final Value (at 100 seconds) = 1 Final Value (at 200 seconds) = 2 Final Value (at 300 seconds) = 3

How can I do this?

Thanks in advance!