n=int(input())
if n==1:
    print("NO")
    exit()

import math

def is_prime(num):
    if num < 2:
        return False
    elif num == 2:
        return True
    elif num % 2 == 0:
        return False
    
    sqrtNum = math.floor(math.sqrt(num))
    for i in range(3, sqrtNum + 1, 2):
        if num % i == 0:
            return False
    
    return True

if not is_prime(n):
    print("YES")
else:
    print("NO")