#include <stdio.h>
#include <math.h>
long n,p;
int main ()
{
    freopen ("fact.in","r",stdin);
	freopen ("fact.out","w",stdout);
	int i,aux;
	scanf ("%d",&p);
	if (p==0)
	{
		  printf ("1");return 0;
	}
	i=0;
	n=0;
	while (i<p)
	{
		  n+=5;
		  aux=n;
		  while (aux%5==0)
		  {
				i++;
				aux/=5;
		  }
	}
	if (i==p)
		  printf ("%d",n);
	else
		  printf ("-1");
	return 0;
}