#include <cstdio>
using namespace std;
FILE *f1, *f2;
long long i = 5,x;
long int nrz = 0,p;
int main()
{
	f1 = freopen("fact.in", "r", stdin);
	scanf("%li", &p);
	
	while(nrz<p)
	{
		x=i;
		while(x%5 == 0)
		{
			nrz++;
			x/=5;
		}
		i+=5;		
	}
	i-=5;
	f2 = freopen("fact.out", "w", stdout);
	if(nrz == p) printf("%lli\n", i);
	else printf("-1\n");
	fclose(f2);
	fclose(f1);
	return 0;
}