#include <fstream>
using namespace std;

int i = 5, o, p;

int main()
{
	long count = 0;
	bool stupid = false;
	ifstream f ("fact.in");
	ofstream g ("fact.out");
	
	f >> p;
	
	if(p != 0)
	{
		while(1)
		{
			o = i;
			while(o % 5 == 0)
			{
				o /= 5;
				count ++;
			}
			if(count >= p)
			{
				if(count == p)
					break;
				else
				{
					stupid = true;
					break;
				}
			}
			i += 5;
		}
		if(!stupid)
			g << i;
		else
			g << "-1";
	}
	else
		g << "1";
}