import collections

def prime_factorize(n):
    a = []
    while n % 2 == 0:
        a.append(2)
        n //= 2
    f = 3
    while f * f <= n:
        if n % f == 0:
            a.append(f)
            n //= f
        else:
            f += 2
    if n != 1:
        a.append(n)
    return a

def n_fact(N):
    c = collections.Counter(prime_factorize(N))
    return c

dic = n_fact(int(input()))
tmp = 0
for k,v in dic.items():
    tmp += v
if tmp > 2:
    print("YES")
else:
    print("NO")