def is_prime(q,k=50):
    q = abs(q)

    if q == 2: return True
    if q < 2 or q&1 == 0: return False

    d = (q-1)>>1
    while d&1 == 0:
        d >>= 1

    for i in xrange(k):
        a = random.randint(1,q-1)
        t = d
        y = pow(a,t,q)

        while t != q-1 and y != 1 and y != q-1: 
            y = pow(y,2,q)
            t <<= 1
        if y != q-1 and t&1 == 0:
            return False
    return True

d = int(raw_input())

if is_prime(d):
    print("NO")
else:
    print("YES")