#include <iostream>
#include <fstream>
using namespace std;
int main()
{
  int p, i = 0, n = 5, k;
  ifstream f("fact.in");
  ofstream g("fact.out");
  f >> p;
  while (n) {
    i++;
    k = n / 5;
    while (k % n == 0) {
      k /= 5;
      i++;
    }
    if (i == p) {
      g << n; break;
    }
    if (i > p) {
      g << -1; break;
    }
    n += 5;
  }
  f.close ();
  g.close ();
  return 0;
}