import strutils, tables


proc isUsableNum(a: int): bool =
  var
    x = a
    dic = initCountTable[int]()
    i = 2

  while i * i <= a:
    while x mod i == 0:
      inc dic, i
      x = x div i
    inc i

  if x != 1 and x != a: inc dic, x

  if dic.len >= 3: return true
  for k, v in dic:
    if v >= 2: return true


proc main: void =
  let n = parseInt readLine stdin
  ["NO", "YES"][n.isUsableNum.int].echo


when isMainModule:
  main()