fun readInt () =
    valOf (TextIO.scanStream (Int.scan StringCvt.DEC) TextIO.stdIn)

fun readLargeInt () =
    valOf (TextIO.scanStream (LargeInt.scan StringCvt.DEC) TextIO.stdIn)

fun quicksort [] = []
  | quicksort (h::tl) =
    let 
        val (s, b) =
            List.foldl
                (fn (x, (small, big)) =>
                    if x <= h then (x::small, big)
                    else (small, x::big))
                ([], [])
                tl
    in
        (quicksort s) @ [h] @ (quicksort b)
    end

fun findAns [] (_, true) = 1
  | findAns [] (_, false) = 0 
  | findAns (h :: tl) (old, true) =
    if h = old then findAns tl (old, false)
    else 1 + findAns tl (h, true)
  | findAns (h :: tl) (old, false) = 
    if h = old then findAns tl (old, false)
    else findAns tl (h, true)


val () =
    let
        val n = readInt ()
        val a_s = List.tabulate (n, fn _ => readLargeInt ())

        val sorted = quicksort a_s

        val ans = findAns sorted (~1, false)
    in
        print (Int.toString ans ^ "\n")
    end