#define DEBUG 0
#include<fstream>
using namespace std;

inline int fact(int zeros)
{
    return (zeros - (zeros/6) - (zeros/30))*5;
}


int main()
{
    int p;
    ifstream in ("fact.in");
    ofstream out ("fact.out");
    in>>p;

#if DEBUG == 1
    for (p = 0; p < 100; p++) {
        out<<"("<<p<<") -> ";
#endif
        if (p == 0) out<<1;
        else if ((p+1) % 6 == 0 || (p%30 == 0)) out<<-1;
        else out<<fact(p);
#if DEBUG == 1
        out<<endl;
    }
#endif
    out.close();
    return 0;
}