#include <iostream>
#include <fstream>
std::ifstream f("fact.in");
std::ofstream g("fact.out");
int main()
{
	int p;
	f >> p;
	
	if (p == 0)
		std::cout << 1;
	int n = 5;
	int nb_of5 = 0;
	bool adev = true;
	while (adev)
	{
		int temp = n;
		do
		{
			temp /= 5;
			nb_of5++;

		} while (temp % 5 == 0);
		//std::cout << n << " " << nb_of5 << ' ';
		if (nb_of5 == p)
		{
			g << n;
			return 0;
		}
		if (nb_of5 > p)
		{
			g << "-1";
			return 0;
		}
		n+=5;
	}
	std::cout << n;
}