class PrimeNumbers:
    def __init__(self, nmax):
        self.prime_judgement = [True]*(nmax+1)
        self.prime_judgement[0] = self.prime_judgement[1] = False
        for i in range(2, nmax+1):
            if self.prime_judgement[i]:
                for j in range(2, nmax//i+1):
                    self.prime_judgement[i*j] = False
        self.prime_list = []
        for i, flag in enumerate(self.prime_judgement):
            if flag: self.prime_list.append(i)
m = int(input())
pn = PrimeNumbers(10**3)
r = [1]
while r[-1]*2+1 <= m: r.append(r[-1]*2+1)
i = 0
ans = {1}
while m:
    while r[-1] > m: r.pop()
    p = pn.prime_list[i]; j = 1
    for _ in range(len(r)):
        while p*j in ans: j += 1
        ans.add(p*j)
    i += 1; m -= r[-1]
print(len(ans))
print(*ans)