&control
   calculation='scf',
   prefix='silicon',
   restart_mode='from_scratch',
   tstress = .true.,
   tprnfor = .true.,
   pseudo_dir = './',
   outdir='./'
/
&system    
   ibrav=  2, celldm(1) =10.2, nat=  2, ntyp= 1,
   ecutwfc = 18.0
/
&electrons
/
ATOMIC_SPECIES
 Si  28.086  Si.vbc.UPF
ATOMIC_POSITIONS
 Si 0.00 0.00 0.00 
 Si 0.25 0.25 0.25 
K_POINTS {automatic}
4 4 4 1 1 1
