#include <bits/stdc++.h>
using namespace std;
const long long MOD = 1E9 + 7, INF = 2E18 + 5;
const double PI = 2 * acos(0.0);
const long double EPS = 1.0E-14;
vector<long long> vec;
long long trailingZero(long long n) {
  long long zero = 0;
  while (n / 5 != 0) {
    zero += (n / 5);
    n /= 5;
  }
  return zero;
}
int main() {
  long long n, L, R, mid, zero, ans = -1;
  cin >> n;
  L = 1, R = 5 * n;
  while (L <= R) {
    mid = (L + R) / 2;
    zero = trailingZero(mid);
    if (zero == n) {
      ans = mid;
      R = mid - 1;
    } else if (zero > n) {
      R = mid - 1;
    } else if (zero < n) {
      L = mid + 1;
    }
  }
  if (ans == -1)
    cout << 0;
  else {
    for (int i = ans;; i++) {
      if (trailingZero(i) == n) {
        vec.push_back(i);
      } else
        break;
    }
    cout << vec.size() << "\n";
    for (int i = 0; i < vec.size(); i++) {
      cout << vec[i] << " ";
    }
    cout << endl;
  }
  return 0;
}
