#include <bits/stdc++.h>
const int N = 1e7 + 100;
int m;
int f[N];
void init() { std::cin >> m; }
void work() {
  f[0] = 0;
  for (int i = 1; i <= 10000000; i++) {
    f[i] = i / 5 + f[i / 5];
  }
  int count = 0;
  for (int i = 1; i <= 10000000; i++) {
    if (f[i] == m) {
      count++;
    }
  }
  std::cout << count << std::endl;
  for (int i = 1; i <= 10000000; i++) {
    if (f[i] == m) {
      printf("%d ", i);
    }
  }
  printf("\n");
}
int main() {
  init();
  work();
  return 0;
}
