#include<stdio.h>
#include<math.h>
int main()
{
freopen("fact.in","r",stdin);
freopen("fact.out","w",stdout);
long int i,j,p,k;
j=0;
scanf("%ld",&p);
if (p==0)
	{
	printf("1");
	return 0;
	}
for (i=0;i<100000000;i=i+5)
	{
	k=i;
	while (k%5==0 && i!=0)
		{
		j++;
		k/=5;
		}
	if (p==j)
			{
			printf("%ld",i);
//			gasit=0;
			break;
			}
   if (j>p)
   		{
	      printf("-1");
	      return 0;
	      }

	}
//if (gasit==1)
//	printf("-1");
//fclose(stdin);
//fclose(stdout);
return 0;
}