import sys
import random

def miller_rabin_pass(base, s, d, n, pow=pow):
  base = pow(base, d, n)
  if base == 1 or base == n - 1:
    return True
  for _ in range(s - 1):
    base = base * base % n
    if base == n - 1:
      return True
  return False

def miller_rabin(n):
  if n <= 1:
    return False
  if n <= 3:
    return True

  d = n - 1
  s = d & -d
  s = s.bit_length() - 1
  d >>= s

  if n < 316349281:
    if n < 1373653:
      bases = [2, 3]
    else:
      bases = [11000544, 31481107]
  elif n < 154639673381:
    if n < 4759123141:
      bases = [2, 7, 61]
    else:
      bases = [15, 176006322, 4221622697]
  elif n < 47636622961201:
    bases = [2, 2570940, 211991001, 3749873356]
  elif n < 3770579582154547:
    bases = [2, 2570940, 880937, 610386380, 4130785767]
  elif n < (1 << 64):
    bases = [2, 325, 9375, 28178, 450775, 9780504, 1795265022]
  else:
    bases = [random.randrange(n - 1) + 1 for _ in range(30)]

  for base in bases:
    if not miller_rabin_pass(base, s, d, n):
      return False
  return True

def solve():
  stdin = sys.stdin
  N = int(stdin.readline())
  print("YES" if not miller_rabin(N) and N != 1 else "NO")

solve()