/* -*- coding: utf-8 -*-
 *
 * 2081.cc:  No.2081 Make a Test Case of GCD Subset  - yukicoder
 */

#include<cstdio>
#include<vector>
#include<algorithm>
 
using namespace std;

/* constant */

const int MAX_N = 100000;
const int MAX_P = 100000;

/* typedef */

typedef vector<int> vi;

/* global variables */

bool primes[MAX_P + 1];
int as[MAX_N];

/* subroutines */

int gen_primes(int maxp, vi &pnums) {
  fill(primes, primes + maxp + 1, true);
  primes[0] = primes[1] = false;

  int p;
  for (p = 2; p * p <= maxp; p++)
    if (primes[p]) {
      pnums.push_back(p);
      for (int q = p * p; q <= maxp; q += p) primes[q] = false;
    }
  for (; p <= maxp; p++)
    if (primes[p]) pnums.push_back(p);
  return (int)pnums.size();
}

/* main */

int main() {
  vi pnums;
  int pn = gen_primes(MAX_P, pnums);
  //printf("pn=%d\n", pn);

  int m;
  scanf("%d", &m);

  int n = 0, pi = 0;
  while (m > 0) {
    int l = 1;
    while ((1 << (l + 1)) - 1 <= m) l++;
    m -= (1 << l) - 1;

    for (int i = 0; i < l; i++) as[n++] = pnums[pi];
    pi++;
  }

  for (int i = 0; i < n; i++) as[i] *= pnums[pi++];

  printf("%d\n", n);
  for (int i = 0; i < n; i++)
    printf("%d%c", as[i], (i + 1 < n) ? ' ' : '\n');

  return 0;
}