&control
    calculation='vc-relax'
    restart_mode='from_scratch',
    tstress = .true.
    tprnfor = .true.
    prefix='carbon',
    pseudo_dir = './',
    outdir='./'
    forc_conv_thr = 1.0D-4,
    etot_conv_thr = 1.0D-5,
    nstep = 100 ,
    wf_collect=.true.,
 /
 &system
                     nosym = .false.,
                     ibrav = 4,
			celldm(1) = 4.662545627,
                     celldm(3) = 2.774815903,
                     nat = 4,
                     ntyp = 1,
                     occupations = 'smearing',
			ecutwfc = 120,
			ecutrho = 720,
                     degauss = 0.05,
 /
 &ELECTRONS
               diagonalization = 'cg' ,
               electron_maxstep = 150,
 /
 &IONS
  ion_dynamics='bfgs',
  pot_extrapolation = "first_order",
 /
 &CELL
   cell_dynamics = 'bfgs' ,
   cell_factor = 1.6,
   press = 0 ,
   !cell_dofree = 'xyz',  
 /
ATOMIC_SPECIES
 C    12    C.pz-van_ak.UPF
!PSEUDO
ATOMIC_POSITIONS  crystal
C      0      0      0
C     -0.333333      0.333333      0
C     -0.3333333 0.33333333 0.5
C     -0.6666667 0.66666667 0.5
K_POINTS automatic 
 10 10 4 0 0 0
!K