#include <fstream>
using namespace std;
ifstream cin("sortaret.in");
ofstream cout("sortaret.out");
typedef struct celula{
                int nod;
                celula *next;
                } *lista;
lista gr[50010],v;
int used[50010],n,m,st[50010],i,x,y,cnt=0;

void df(int nod)
{
   used[nod]=1;
   for (lista p=gr[nod];p;p=p->next)
      if (!used[p->nod]) df(p->nod);
   st[++cnt]=nod;

}

int main()
{
    cin>>n>>m;
    for (i=1;i<=m;i++)
        cin>>x>>y, v=new celula, v->nod=y, v->next=gr[x], gr[x]=v;
    df(1);
    for (i=n;i>0;i--) cout<<st[i]<<" ";
    return 0;
}