#include<stdio.h>
#include<math.h>
int main()
{
freopen("factorial.in","r",stdin);
freopen("factorial.out","w",stdout);
int p;
int i,j,o,n,gasit=1;
int k;
j=0;
scanf("%d",&p);
if (p==0)
	{
	printf("1");
	return 0;
	}
for (i=0;i<100000;i=i+5)
	{
	k=i;
	while (k%5==0 && i!=0)
		{
		j++;
		k/=5;
		}
	if (p==j)
			{
			printf("%d",i);
			gasit=0;
			break;
			}

	}
if (gasit==1)
	printf("-1");
return 0;
}