# include <fstream>
using namespace std;
ifstream fin ("fact.in");
ofstream fout("fact.out");
int main()
{
    int n,n1,cnt=0;
    fin>>n;
    n1=n;
    if(!n)
        fout<<1;
    else
        if((n-5)%6==0)
            fout<<-1;
    else
    {
        while(n>5)
        {
            n-=5;
            cnt++;
        }
        fout<<(n1-cnt)*5;
    }
    return 0;
}