How can I count how many times the position of a bouncing ball on the simulator hits 0?

I'm using MathWorks' sample simulink model for a bouncing ball and I wanted to know if there is any way to calculate how many times the position hits 0 when simulating the model. I'm have just begun using Matlab and Simulink so I'm sorry if it is something obvious. Anyway thanks in advance! (included a printscreen of the model in case anyone wanted to know which one it was)

Answer 1

[Paul]

Drag a Triggered Subsystem into the diagram.

Connect the output of the <=0 block to the trigger input of the Triggered Subsystem

The inside of the Triggered Subsystem should look like this:

Double click the Memory block, check the box for Inherit Sample Time.

The output of the Triggered Subsystem is the bounce count.

Comment: Initializing the ball at 0 does not count as bounce.