#include <bits/stdc++.h>
using namespace std;
int n;
int solve(int x) {
  int c = 0;
  for (int i = 5; x / i >= 1; i *= 5) c += x / i;
  return c;
}
int main() {
  cin >> n;
  int f = 0, l = 1e9, mid;
  bool b = false;
  while (f < l) {
    mid = (f + l) / 2;
    int temp = solve(mid);
    if (temp < n)
      f = mid + 1;
    else
      l = mid;
  }
  if (solve(l) == n)
    b = true, mid = l;
  else if (solve(mid) == n)
    b = true;
  if (!b) {
    cout << 0 << endl;
    return 0;
  }
  cout << 5 << endl;
  for (int i = 0; i < 5; i++) cout << mid + i << " ";
  cout << endl;
  return 0;
}
