#include<fstream>
using namespace std;
int n, p;
int main(){
	ifstream cin("fact.in");
	ofstream cout("fact.out");
	cin>>p;
	n=p*5-5*(p/6);
	if(p==0)n=1;
	if(p%6==5)n=-1;
	cout<<n;
	return 0;
}