#include <fstream>


const unsigned int NUM_MAX_SIZE = 500;

struct Numar {
    char n[NUM_MAX_SIZE];
    unsigned int nr_size;
    void Set(unsigned long);
};


using namespace std;

int main (void)
{
    ifstream f_in("fact.in");
    ofstream f_out("fact.out");
    
    unsigned long P;
    f_in>>P;
    f_in.close();
    
    //Numar nr;
    
    unsigned int nr_zerouri=0;
    bool gasit=false, imposib=false;
    for (unsigned int i=1; !gasit && !imposib; i++) {
        if (i%5==0) {
            unsigned int w=i;
            while (w%5 == 0) { w/=5; nr_zerouri++; }
        }
        nr_zerouri++;
        if (nr_zerouri == P) {
            gasit = true;
            f_out << ((unsigned long long)i)*5 << '\n';
        } else if (nr_zerouri > P) {
            imposib = true;
            f_out << "-1\n";
        }
    }
    
    
    f_out.close();

}