&control
   calculation='scf',
   prefix='Si'
   pseudo_dir = './pseudo/',
   outdir='./tmp/'
/
&system
   ibrav=2, celldm(1)=10.26, nat=2, ntyp=1,
   ecutwfc=18.0
/
&electrons
/
ATOMIC_SPECIES
 Si  28.086  Si.pz-vbc.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