&FORCE_EVAL
  METHOD FIST
  &MM
    &FORCEFIELD
      &SPLINE
        EPS_SPLINE 1.E-5
      &END
      &BOND
        ATOMS O H
        KIND QUARTIC
        K 0.4015204 0.0 0.0
        R0 1.812
      &END BOND
      &BOND
        ATOMS H H
        KIND QUARTIC
        K 0.02384043 -0.0506033 0.0287044
        R0 3.0699
      &END BOND
      &CHARGE
        ATOM O
        CHARGE -0.7699784
      &END CHARGE
      &CHARGE
        ATOM H
        CHARGE 0.3849892
      &END CHARGE
      &NONBONDED
        &IPBV
          atoms O O
          RCUT 7.8
        &END IPBV
        &IPBV
          atoms H O
          RCUT 7.8
        &END IPBV
        &IPBV
          atoms H H
          RCUT 7.8
        &END IPBV
      &END NONBONDED
    &END FORCEFIELD
    &POISSON
      &EWALD
        EWALD_TYPE spme
        ALPHA .44
        GMAX 25
        O_SPLINE 4
      &END EWALD
    &END POISSON
  &END MM
  &SUBSYS
    &CELL
      ABC 24.955 24.955 24.955
    &END CELL
    &TOPOLOGY
      CONN_FILE_NAME ../sample_psf/ipbv_flex.psf
      CONNECTIVITY UPSF
      COORD_FILE_NAME ../sample_pdb/ipbv.pdb
      COORDINATE pdb
    &END TOPOLOGY
  &END SUBSYS
&END FORCE_EVAL
&GLOBAL
  PROJECT water_massive
  RUN_TYPE MD
&END GLOBAL
&MOTION
  &MD
    ENSEMBLE NVT
    STEPS 3
    TIMESTEP 0.5
    TEMPERATURE 298
    &THERMOSTAT
      REGION MASSIVE
      &NOSE
        LENGTH 3
        YOSHIDA 3
        TIMECON 1000
        MTS 2
      &END NOSE
    &END
  &END MD
&END MOTION
