#include <fstream>
using namespace std;
ifstream in("fact.in");
ofstream out("fact.out");   
int main()
{
	int p, n=0, r=0, m;
	in>>p;
	if (p==0)
	{
		n=1;
		out<<n;
		return 0;
	}
	while (n<=p*5)
	{
		n=n+5;
		m=n;
		r++;
		while(m%25==0)
		{
			m=m/5;
			r++;
		}
		if (r==p)
		{
			out<<n;
			return 0;
		}
		if (r>p)
		{
			n=-1;
			out<<n;
			return 0;
		}
	}
}