O

#include <iostream>

#define int long long
using namespace std;
int count1(int N)
{
    int res = 0;
    while (N > 0)
    {
        res += (N / 5);
        N /= 5;
    }
    return res;
}
main()
{
    int m, begin1, p = 0;
    cin >> m;
    for (int i = 1; i <= 1000000; i++)
    {
        if (count1(i) == m)
        {
            begin1 = i;
            ++p;
            break;
        }
        else if (count1(i) > m)
            break;
    }
    if (p == 0)
        cout << 0;
    else
    {
        for (int i = begin1 + 6; i >= begin1 + 1; i--)
        {
            if (count1(i) == m)
            {
                cout << i - begin1 + 1 << endl;
                for (int j = begin1; j <= i; j++)
                    cout << j << " ";
                break;
            }
        }
    }
}