integer  nam, npm
      integer  lpm, namh, nalstm
      integer  nzm, nlm
c
c  nam is the maximum number of grids per dimension.
c        nam = 2**lpm
c  npm is the maximum number of macro particles.
c  nzm is the maximum number of step for z direction
c              ( direction of evolution ).
c    lp  = 1  2  3   4   5   6    7    8     9    10 
c    nam = 2  4  8  16  32  64  128   256  512  1024 
c
      parameter  ( lpm = 7 , npm = 16001 )
      parameter  ( nam = 2**lpm ) 
      parameter  ( namh=nam/2, nalstm= namh*(nam+1) )
      parameter  ( nzm = 1000 )
      parameter  ( nlm = 1000 )
c
      integer  ngm, nzt, nxp, nyp, npx, npy
      parameter ( nzt=1, ngm=2, nxp=3, nyp=4, npx=5, npy=6)
c
      integer  na, np, na2, lp, nalst
      common  / sizes / na, np, na2 ,lp, nalst
c