#include<fstream.h>
#define MAX 501

int n,m,numar[MAX],urm[MAX][MAX],coada[MAX],este[MAX];

int main()
{
  ifstream f("sortaret.in");ofstream g("sortaret.out");
  int i,x,y;
  f>>n>>m;
  for(i=1;i<=m;i++){f>>x>>y;este[x]=este[y]=1;numar[y]++;urm[x][++urm[x][0]]=y;}
  int p=1,u=0;
  for(i=1;i<=n;i++)
    if(este[i] && numar[i]==0)coada[++u]=i;
  while(p<=u)
  {
    for(i=1;i<=urm[coada[p]][0];i++)
    {
      numar[urm[coada[p]][i]]--;
      if(numar[urm[coada[p]][i]]==0)coada[++u]=urm[coada[p]][i];
    }
    p++;
  }
  for(i=1;i<=u;i++)g<<coada[i]<<' ';
  f.close();g.close();
  return 0;
}