import strutils, math
let N = stdin.readLine.parseInt

proc isPrime(x: int): bool =
  if x > 2 and (x mod 2 == 0): return false

  for i in countup(3, int.high, 2):
    if i ^ 2 > x: break
    if x mod i == 0: return false

  result = true



if N.isPrime:
  echo "NO"
else:
  for i in countup(1, N):
    if i ^ 2 > N: break
    if not i.isPrime:
      echo "YES"
      quit()

  echo "NO"