  The results of Monte-Carlo simulations of Extensive Air Shower are presented
to show the difference of hadronic component content at various altitudes with
the aim to choose an optimal altitude for the PRISMA-like experiment. CORSIKA
program for EAS simulations with QGSJET and GHEISHA models was used to
calculate the number of hadrons reaching the observational level inside a ring
of 50 m radius around the EAS axis. Then the number of neutrons produced by the
hadronic component was calculated using an empirical relationship between the
two components. We have tested the results with the ProtoPRISMA array at sea
level, and recorded neutrons are close to the simulation results.
