#include <fstream>
using namespace std;

fstream f("fact.in" ,ios::in), g("fact.out", ios::out);

int main()
{
    unsigned long long p,nr,aux,t;
    f>>p;
    if(p==1)
        g<<"0";
    else
        if ((p+1)%6==0)
            g<<"-1";
        else
        {
            nr=5;
            t=1;
            while (t<p)
            {
                nr+=5;
                aux=nr;
                while (aux%5==0)
                {
                    aux/=5;
                    t++;
                }
            }
            g<<nr;
        }
    return 0;
}