#include <fstream>
using namespace std;
int a[100001];
int main()
{
    ifstream fin("fact.in");
    ofstream fout("fact.out");
    int no=0,a=5,b,c,n,m,p;
    fin>>p;
    if(p>0)
    {while(no<p){
       no++;
        b=a;
            b/=5;
            if(b%5==0){
                no++;
                b/=5;
                while(b%5==0) {
                    b/=5;
                    no++;
                }
            }
        a+=5;
    }
    if(no==p)
    fout<<a-5;
    else fout<<-1;}
    else fout<<1;
    return 0;
}