M = int(input())

prime = []
C = 5000
dat = [0] * C
for i in range(2,C):
    if dat[i] == 0:
        prime.append(i)
        for j in range(i,C,i):
            dat[j] = 1
l = []
for i in range(30):
    mask = 1 << i
    if mask & M:
        l.append(i)
ans = []
n = len(l)
for i in range(n-1,-1,-1):
    p = prime[i]
    now = 1
    for _ in range(l[i]):
        now *= p
        ans.append(now)
for j in range(n):
    ans.append(prime[n + j])
print(len(ans))
print(*ans)