How to measure/calculate the number of incoming particles?

Hi,

is there a way to measure the incoming particles emitted from a spherical particle system?

I’d like to somehow get the exact number of particles hitting/colliding with a given object (i.e. a cube somewhere placed in the room)

Thanks in advance!

Can anybody help me with my issue?
It’s pretty important to me.

I know where to look for to find the total number of particles emitted by a particle system, but that is not that important for me.