#include <iostream>
#include <stdio.h>
#include <math.h>
#include <iomanip>
using namespace std;
const int N = 1e5 + 10;
const int INF = 0x3f3f3f3f;
int n; 
int main()
{
	cin >> n;
	cout << n * 2 << endl;
	for( int i = 1 ; i < n ; i++ )
	{
		if( n % i == 0 )
		{
			cout << i << " ";
		}
	}
    return 0;
}