#include <iostream>
#include <algorithm>
#include <iomanip>
#include <vector>
#include <queue>
#include <deque>
#include <set>
#include <map>
#include <tuple>
#include <cmath>
#include <numeric>
#include <functional>
#include <cassert>

#define debug_value(x) cerr << "line" << __LINE__ << ":<" << __func__ << ">:" << #x << "=" << x << endl;
#define debug(x) cerr << "line" << __LINE__ << ":<" << __func__ << ">:" << x << endl;

template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }

using namespace std;
typedef long long ll;

template<typename T>
vector<vector<T>> vec2d(int n, int m, T v){
    return vector<vector<T>>(n, vector<T>(m, v));
}

template<typename T>
vector<vector<vector<T>>> vec3d(int n, int m, int k, T v){
    return vector<vector<vector<T>>>(n, vector<vector<T>>(m, vector<T>(k, v)));
}

template<typename T>
void print_vector(vector<T> v, char delimiter=' '){
    if(v.empty()) {
        cout << endl;
        return;
    }
    for(int i = 0; i+1 < v.size(); i++) cout << v[i] << delimiter;
    cout << v.back() << endl;
}

const int N = 100000;

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout << setprecision(10) << fixed;
    vector<bool> is_prime(N+1, true);
    is_prime[0] = false;
    is_prime[1] = false;
    deque<int> primes;
    for(int p = 2; p <= N; p++){
        if(!is_prime[p]) continue;
        primes.push_back(p);
        for(int i = 0; i*p <= N; i++) is_prime[i*p] = false;
    }
    int m; cin >> m;
    vector<int> ans;
    for(int i = 30; i >= 1; i--){
        int x = (1<<i)-1;
        while(m >= x){
            int p = primes.front(); primes.pop_front();
            for(int j = 0; j < i; j++){
                while((ll)primes.back()*p > N) primes.pop_back();
                int q = primes.back(); primes.pop_back();
                ans.push_back(p*q);
            }
            m -= x;
        }
    }
    cout << ans.size() << endl;
    print_vector(ans);
}