#include <fstream>
#include <math.h>

using namespace std;
ifstream f("fact.in");
ofstream g("fact.out");
unsigned long long p;
unsigned long long n=1;
unsigned long long count=0;
unsigned long long fact(unsigned long long n)
{
    unsigned long long factorial=1;

    for(unsigned long long i=2;i<=n;i++){
           factorial=factorial*i;
        }


   return factorial;
}

 int main()
{
    f>>p;
    if(p==0){
        g<<n;
    }else{
        for(long long i=5*(p-1);i<=5*p;i++){
            if(fact(i)%(10^p)==0){
                n=i;
                break;
            }
        }
        if(n!=1)
            g<<n;
        else
            g<<-1;
    }

}