recursive function qsort(x) result(y)
  integer,intent(in) ::x(:)
  integer,allocatable::y(:)
  integer::pivot,total
  total = size(x)
  if (total <=1) then
     y = x
  else
     pivot = x(total/2)
     y = [qsort(pack(x, x .lt. pivot)), &
          pack(x, x .eq. pivot),        &
          qsort(pack(x, x .gt. pivot))]
  endif
end function qsort

program main
  interface
     recursive function qsort(x) result(y)
       integer,intent(in) ::x(:)
       integer,allocatable::y(:)
     end function qsort
  end interface
  integer::N,total=0
  integer,allocatable::s(:),a(:)
  read *,N
  allocate(a(0:N+1),s(N))
  read *,a(1:N)
  s = qsort(a(1:N))

  a(0)   = 0
  a(N+1) = 0
  do i=1,N
     if(a(i).ne.a(i-1).and.a(i).ne.a(i+1))then
        total = total + 1
     end if
  end do
  print '(i0)', total
end program main