program main
  implicit none
  integer i,A(8),X,ans,div
  read(*, *)X
  ans = 1
  div = 1800
  do
    if (X < div) then
      ans = ans + 1
      div = div -200
    else
      exit
    end if
  end do
  !read(*, *) (L(i), i = 1,N)

  write(*, *) ans
end program main
