#include <bits/stdc++.h>
using namespace std;
int fun(int n) {
  int ans = 0;
  while (n) {
    ans += n / 5;
    n = n / 5;
  }
  return ans;
}
int bsearh(int x, int y, int v) {
  int ans = 0;
  int mid = 0;
  while (x <= y) {
    mid = (x + y) / 2;
    int cnt = fun(mid);
    if (cnt < v)
      x = x + 1;
    else {
      y = mid - 1;
      ans = mid;
    }
  }
  return ans;
}
int main() {
  int m;
  while (cin >> m) {
    int i, x = 1, y = 1000000000;
    int L = bsearh(x, y, m);
    int R = bsearh(x, y, m + 1);
    if (L == 0 || fun(R - 1) != m) {
      cout << 0 << endl;
    } else {
      cout << R - L << endl;
      for (i = L; i <= R - 1; i++) {
        cout << i;
        if (i != R - 1)
          cout << " ";
        else
          cout << endl;
      }
    }
  }
  return 0;
}
