#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <vector>
#include <queue>
using namespace std;
FILE *fin,*fout;

vector <int> graf[500005];
int verf[500005];
int varf[500005];

void Topo(int nod){
  if(verf[nod]==0){
    verf[nod]=1;
    fprintf(fout,"%d ",nod);
    for(int neigh : graf[nod]){
      Topo(neigh);
    }
  }
}

int main(){
  int n,m,i,top,x,y;
  fin=fopen("sortaret.in","r");
  fout=fopen("sortaret.out","w");
  fscanf(fin,"%d%d",&n,&m);

  for(i=0;i<m;i++){
    fscanf(fin,"%d%d",&x,&y);
    varf[y]=1;
    graf[x].push_back(y);
  }
  i=1;
  while(varf[i]==1){
    i++;
  }
  top=i;
  Topo(top);

  fclose(fin);
  fclose(fout);
  return 0;
}