class primes():
    def __init__(self, n):
        self.prime_num = n
        self.min_prime = [-1] * (self.prime_num + 1)  # 2以上の自然数に対して最小の素因数を表す
        self.min_prime[0] = 0
        self.min_prime[1] = 1
        i = 2
        self.prime = []
        self.memo_prifac = {}
        while i <= self.prime_num:
            if self.min_prime[i] == -1:
                self.min_prime[i] = i
                self.prime.append(i)
            for j in self.prime:
                if i * j > self.prime_num or j > self.min_prime[i]: break
                self.min_prime[j * i] = j
            i += 1

    def prifac(self, n):
        # 素因数分解した結果を返す
        if n in self.memo_prifac:
            return self.memo_prifac[n]
        res = {}
        x = n
        while x > 1:
            p = self.min_prime[x]
            if p in res:
                res[p] += 1
            else:
                res[p] = 1
            x //= p

        # self.memo_prifac[n] = res  #場合によってはこの行を消すと高速化

        return res

    def divisors(self, n):
        # 約数列挙 メモした方がいいかも
        if n== 1: return [1]
        prf = self.prifac(n)
        keys = [key for key in prf]

        def divsearch(i):
            if i == len(keys) - 1:
                return [keys[i] ** j for j in range(prf[keys[i]] + 1)]
            else:
                res = []
                subres = divsearch(i + 1)
                p = keys[i]
                for j in range(prf[p] + 1):
                    for node in subres:
                        res.append(node * p ** j)
                return res

        return divsearch(0)

pri=primes(10**5+10)
def make(m):
    if m==0:
        m=998244353
    p=pri.prime
    ind=0
    ind2=-1
    while p[ind2]>10**5:ind2-=1
    a=[]
    for i in range(29,-1,-1):
        if m-2**i>=0:
            for _ in range(i):
                a.append(p[ind])
            ind+=1
            a.append(p[ind2])
            ind2-=1
            m-=2**i
    n=len(a)
    for i in range(n-1,-1,-1):
        if a.count(a[i])>=2:
            a[i]*=p[ind]
            ind+=1
    return n,a

m=int(input())
n,a=make(m)
print(n)
print(*a)