Add to custom properties

[amcadam@animmersion.co.uk]

Hi.
I'd like to add a value to a custom property and I can't figure it out.

I have 3 events A, B and C.

Event A has a custom property called 'hit' set to 1.

Event B has the custom property 'hit' set to current value, and a collision operator that sends out to event C.

In event C I want to add 1 to 'hit' and then it loops back around the event B.

Is it possible in event C to just add 1 every time the collision happens? This is where I'm stuck.

Thanks
Andy