import math

n = int(input())

a = 0
for i in range(2 , int(math.sqrt(n)) + 1):
	flag = True
	for j in range(2, int(math.sqrt(n)) + 1):
		if i % j == 0:
			flag = False
			break
			
	if flag: continue
	
	if n % i == 0:
		print("YES")
		a = 1
		break
if a == 0:
	print("NO")