Neutron Multiplicity

Hi ,

I am trying to calculate the number of neutrons produced per muon event( neutron multplicity).I am working on a muon beam of 184 GeV and this beam falls on a rock region of 20mx20mx20m.Inside the region is a cavern of 6mx6mx6m.the cavern is divided into 6 sides RT ( Top region ), RB ( bottom region), RS1, RS2, RS3, RS4 ( the sides of the cavern).I can calculate the number of neutrons on each side of the cavern but I don't know how to find the number of neutrons per muon event.Could you help me? I have attached the input file for your convenience.

Thanks!!

Thilo