import math, itertools, random, collections, time

def suspect(a, e, k, n):
	a = pow(a, e, n)
	if a == 1: return True
	for _ in xrange(k):
		if a == n - 1: return True
		a = a * a % n
	return False

def isprime(n):
	if n == 1: return False
	e = n - 1
	k = 0
	while e % 2 == 0:
		e /= 2
		k += 1
	if n < 2 ** 31:
		bases = [2, 3, 5, 7]
	else:
		bases = [2, 325, 9375, 28178, 450775, 9780504, 1795265022]
	for i in bases:
		if n != i and not suspect(i, e, k, n): return False
	return True

def gcd(a, b):
	if b == 0: return a
	return gcd(b, a % b)

def rho(n):
	for c in xrange(1, n):
		if c == n - 2: continue
		x, y, d = 2, 2, 1
		f = lambda x: (x * x + c) % n
		while d == 1:
			x, y = f(x), f(f(y))
			d = gcd(abs(x - y), n)
		if d != n: return d
	return -1

n = input()
if n == 1:
	print "NO"
elif isprime(n):
	print "NO"
else:
	r = rho(n)
	if r == -1:
		print "NO"
	elif isprime(r):
		if isprime(n / r):
			print "NO"
		else:
			print "YES"
	else:
		print "YES"