#include <iostream>
#include <fstream>
using namespace std;
 int x,n=5,p,s=0;
int main()
{

  ifstream f("fact.in");
  ofstream g("fact.out");
  f>>p;
  if(p==0)
  g<<1;
  else
  {
      while(s<p)
      {
          x=n;
          while(x%10%5==0)
          {
              s++;
              x/=5;
          }
          n=n+5;
      }
      if(s==p)
      {
          n=n-5;
          g<<n;
      }
    else g<<-1;
  }
  return 0;
}