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