import math
def isprime(n):
    if n < 2:
        return False
    if n == 2:
        return True
    if n % 2 == 0:
        return False
    for i in range(3, int(math.sqrt(n)) + 1, 2):
        if n % i == 0: return False
    return True
n=int(input())
if n==1:
    print('NO')
    exit()
if isprime(n):
    print('NO')
else:
    print('YES')