#include <iostream>
#include <vector>
using namespace std;

std::vector<int> enum_prime(int n) // containing n
{
    std::vector<int> res;
    if (n <= 1)
    {
        return res;
    }
    std::vector<bool> p(n + 1);
    fill(p.begin() + 2, p.end(), true);
    for (int i = 2; i <= n; i++)
    {
        if (p[i])
        {
            res.push_back(i);
            for (int j = i * 2; j <= n; j += i)
            {
                p[j] = false;
            }
        }
    }
    return res;
}

int main()
{
    int m;
    cin >> m;
    vector<int> prime = enum_prime(50000);
    int l = 0, r = (int)prime.size() - 1;
    vector<int> ans;
    while (m)
    {
        for (int i = 30; i >= 0; i--)
        {
            if (m >= (1 << i) - 1)
            {
                while (prime[l] * prime[r] > 100000)
                {
                    r--;
                }
                for (int j = 0; j < i; j++)
                {
                    ans.push_back(prime[l] * prime[r--]);
                }
                m -= (1 << i) - 1;
                l++;
                break;
            }
        }
    }
    cout << ans.size() << endl;
    for (int a : ans)
    {
        cout << a << " ";
    }
    cout << endl;
}