#include <deque>
#include <vector>
#include <fstream>

using namespace std;

ifstream fin("fact.in");
ofstream fout("fact.out");

int multipluDe5(int nr, int& p)
{
	int x = 0;

	while (nr && nr % 5 == 0)
	{
		x++;

		nr /= 5;
	}

	p = max(p, x);

	return x;
}

int main()
{
	int n, limita, el, plus5;

	fin >> n;

	if (n == 0)
	{
		fout << 1;

		return 0;
	}

	if (n == 1)
	{
		fout << 5;

		return 0;
	}

	if (n == 2)
	{
		fout << 10;

		return 0;
	}

	el = 10;

	limita = 2;

	plus5 = 1;

	while (limita < n)
	{
		el += 5;

		if (el % 10 == 5)
			limita += multipluDe5(el, plus5);

		else
			limita += plus5;
	}

	if (limita == n)
	{
		fout << el;

		return 0;
	}

	fout << -1;
}