program hello
  use psb_base_mod
  implicit none
  integer iam, np, icontxt, ip, jp, idummy

  call psb_init(icontxt)
  call psb_info(icontxt,iam,np)            
  !   have all processes check in 
  if ((iam >= 0).and.(iam < np)) then 
    if (iam == 0)  then 
      do ip = 1, np-1
        call psb_rcv(icontxt,idummy,ip)          
      enddo
      write(*,*) 'Hello, world: all ',np, &
           & ' processes checked in!'
    else
      call psb_snd(icontxt,idummy,0)
    endif
  end if
  call psb_exit(icontxt)
end program hello