#include <fstream>
using namespace std;

ifstream fin("fact.in");
ofstream fout("fact.out");

int main()
{
    int p,n=0,m,s;
    fin>>p;
    while(p>0)
    {
        s=0;
        m=1;
        while(s<=p+1)
        {
            s=s*5+1;
            m*=5;
        }
        n=n+m/5;
        p=p-(s-1)/5;
    }
    if(n==0)
        fout<<1;
    else
        if(p==0)
            fout<<n;
        else
            fout<<-1;
}