&control
   calculation='vc-relax'
   prefix='Si'
   pseudo_dir='./pseudo/'
   outdir = './tmp/'
   etot_conv_thr = 1.d-5
   forc_conv_thr = 1.d-4
/
&system    
   ibrav=  2, celldm(1) =10.0, nat=  2, ntyp= 1,
   ecutwfc = 30.0, 
/
&electrons
   conv_thr = 1.0d-8
/
&ions
/
&cell
  press_conv_thr = 0.1
/
ATOMIC_SPECIES
 Si  28.086  Si.pz-vbc.UPF
ATOMIC_POSITIONS
 Si 0.00 0.00 0.00 0 0 0
 Si 0.25 0.25 0.25 
K_POINTS automatic
  6 6 6 1 1 1