#include <iostream>
#include <cstdio>
#include <vector>
#include <queue>
using namespace std;

int n,m;
queue<int> Q;
vector <int> v[50005];
int viz[50005];
void scan(){

  cin >> n >> m;
  for(int i =0 ; i < m ; i++){
    int x,y;
    scanf("%d %d",&x,&y);
    v[x].push_back(y);

  }
}

void dfs(int x){

  if(!viz[x])
  Q.push(x);
  viz[x] ++;
  for(int i = 0 ; i < v[x].size();i++){

    if(!viz[v[x][i]])
    {
      dfs(v[x][i]);
    }

  }



}

int main(){

  freopen("sortaret.in","r",stdin);
  freopen("sortaret.out","w",stdout);
  scan();
  for(int i = 1; i <=n; i++){
    dfs(i);
  }
  while(!Q.empty()){

    printf("%d ",Q.front());
    Q.pop();
  }
  return 0;
}