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