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


fun factorization n =
    let
        fun factorizationAux m i =
            if m < i * i
            then
                (
                  if m <> 1 then [m] else []
                )
            else
                (
                  if m mod i = 0
                  then i :: factorizationAux (m div i) i 
                  else factorizationAux m (i + 1)
                )
    in
        factorizationAux n 2
    end

val () =
    let
        val n = readLargeInt ()

        val ans = if 3 <= List.length (factorization n) then "YES"
                  else "NO"
    in
        print (ans ^ "\n")
    end