&control
  calculation = 'scf',
  prefix      = 'Si'
  pseudo_dir  = './pseudo',
  outdir      = './tmp/'
/
&system
  ibrav     = 2,
  celldm(1) = 10.2656,
  nat       = 2,
  ntyp      = 1,
  ecutwfc   = 50.0
/
&electrons
  conv_thr = 1.0d-12
/
ATOMIC_SPECIES
 Si  28.0855  Si.pbesol-n-kjpaw_psl.1.0.0.UPF
ATOMIC_POSITIONS (alat)
 Si 0.00 0.00 0.00
 Si 0.25 0.25 0.25
K_POINTS automatic
 8 8 8 1 1 1