#include<iostream>
#include<fstream>
using namespace std;
int main()
{
	int p,t;
	ifstream f("fact.in");
	ofstream g("fact.out");
	f>>p;
	t=p/5;
	if(p%6==5)
		g<<-1;
	else
		{
			if(p==0)
			g<<1;
		else
		{
		if(p%5!=0)
			g<<(p-t)*5;
		else g<<(p-t+1)*5;
	}
	}
	return 0;
}