N = input()
cnt = 0
is_prime = [True] * (10**7 + 10)
prime = []
def sieve(N):
    is_prime[0] = False
    is_prime[1] = False
    for i in range(2, N):
        if (is_prime[i]):
            prime.append(i)
            for j in range(i*i, N, i):
                is_prime[j] = False
sieve(10 ** 7)
for x in prime:
    if (x * x > N):
        break
    while (N % x == 0):
        N /= x
        cnt += 1
if (N != 1):
    cnt += 1
if (cnt == 0 or cnt == 1 or cnt == 2):
    print "NO"
else:
    print "YES"