#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("fact.in");
ofstream fout("fact.out");
int main()
{
    long long int P;
    fin>>P;
    if (P % 6 == 5)
        fout<<-1;
    if (P == 0)
        fout<<1;
    else
        fout<<5*P - (P/5)*5;
    fin.close();
    fout.close();
    return 0;
}