#include <iostream>
#include <fstream>
using namespace std;
bool v[2000000];
int n;
void ciur ()
{
    int i;
    v[0]=1;
    v[1]=1;
    int j;
    for (i=2;i<=n;i++)
    {
        if (v[i]==0)
        {
            for (j=i+i;j<=n;j=j+i)
            {
                v[j]=1;
            }
        }
    }
}
int main()
{
    ifstream in("ciur.in");
    ofstream out("ciur.out");
    in>>n;
    int i;
    int s=0;
    ciur();
    for (i=1;i<=n;i++)
    {
        if (v[i]==0)
        {
            cout<<i<<"\n";
            s++;
        }
    }
    cout<<"\n"<<s;
    in.close();
    out.close();
    return 0;
}