#include<fstream.h>
ifstream f("fact.in");
ofstream g("fact.out");
int main()
{
unsigned long n=0,p,fife=0,fif;
f>>p;
if(!p)
 g<<1;
else
 {while(n<p)
   {fife+=5;fif=fife;
    while(!(fif%5))
     {n++;fif/=5;}
   }
  if(n==p)
   g<<fife;
  else
   g<<-1;
 }
return 0;
}