#include<stdio.h>
#define Nmax 50010
int n,v[Nmax],uz[Nmax],gre[Nmax],vf;
struct nod
     {
      int info;
      nod *urm;
     };
typedef nod *Lista;
Lista L[Nmax],U[Nmax];
inline void Insert(Lista &prim,Lista p,int x)
     {
      Lista q=new nod;
      q->info=x;
      if(prim){q->urm=p->urm; p->urm=q;}
        else {q->urm=prim; prim=q;}
      }
void DFS(int);
int main()
  {int i,m,x,y;
   freopen("sortaret.in","rt",stdin);
   freopen("sortaret.out","wt",stdout);
   scanf("%d %d",&n,&m);
   for(i=1;i<=m;++i)
      {scanf("%d %d",&x,&y);
       if(L[x])  Insert(L[x],U[x],y),U[x]=U[x]->urm;
         else Insert(L[x],NULL,y),U[x]=L[x];
       gre[y]++;
       }
   for(i=1;i<=n;++i)
      if(gre[i]==0) v[++vf]=i;
   for(i=1;i<=n;++i)
       if(!uz[i]) DFS(i);
   for(i=1;i<=vf;++i) printf("%d ",v[i]);
   return 0;
  }
void DFS(int x)
   {
    uz[x]=1;
    for(Lista p=L[x];p;p=p->urm)
       {
        gre[p->info]--;
        if(gre[p->info]==0) v[++vf]=p->info;
        DFS(p->info);
       }
   }