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