memory size under AIX

Hi,
how to know size of physical memory under AIX ?
Many thanks.
PS :
man -k memory

man : 0703-310 Fichier man introuvable.

uname -a
AIX server1 1 5 005202DF4C00

Use "lsattr -El mem0"

thank you.

How can I know how much of it is free and how much is occupaied ?
Regards.