#include <fstream>
using namespace std;

ifstream in("fact.in",ifstream::in);
ofstream out("fact.out",ofstream::out);

int p;
void cautare()
{
	if (p == 0)
	{
		out<<"1";
		return;
	}
	int put = 0;
	int fact,cop_fact;
	for (fact = 5;put<p;fact+=5)
	{
		cop_fact = fact;
		while (cop_fact%5==0)
		{
			cop_fact/=5;
			++put;
		}
		if (put > p)
		{
			out<<"-1";
			return;
		}
		if (put == p)
			out<<fact;
	}
}

int main()
{
	in>>p;
	cautare();
}