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