#include<fstream>
using namespace std;
int main()
{
    ifstream fin("fact.in");
    ofstream fout("fact.out");
    long int N=1,N1,P,i,nr=0;
    fin>>P;
    for(i=1;i<=P;i++)
                     N=N*5;
    N1=N;
    while(N1%10==0)
                  {N1=N1/10;
                  nr++;
                  }
    if(nr==P) fout<<N;
              else fout<<-1;
    fin.close();
    fout.close();
    return 0;
}