#include <iostream>
#include <fstream>
using namespace std;
ifstream in("fact.in");
ofstream out("fact.out");
int main()
{
    long int n=0,p,f=0,nr=0;
    in>>p;
    while (f<p)
    {
        nr=n+5;
        n=nr;
        while (nr%5==0)
        {
            f++;
            nr=nr/5;
            if (f==p)
                n=-1;
        }
    }
    out<<n;
    return 0;
}