#include <fstream>


int main ()
 {

 int N,P,nr=0,i=5,y;

 std::ifstream f ("fact.in");
 f>>P;
 f.close();

 while (nr<P)
  {
   y=i;
   while (y>5)
    {
     y=y/5;
     nr++;
    }
   i+=5;
  }
 std::ofstream g ("fact.out");
 if (nr==P)
  g<<i;
  else
  g<<-1;
 g.close();




 return 0;
 }