// sortare_topologica.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

//#include "pch.h"
#include <iostream>
#include <fstream>
#include <vector>
#include <list>
using namespace std;

ifstream fin("sortaret.in");
ofstream fout("sortaret.out");
int viz[50000],n,m;
int a[5000][5000];
list<int> l;
void adancime(int k)
{
	
	viz[k] = 1;
	for (int i = 1; i <= n; i++)
	{
		if (a[k][i] and !viz[i])
			adancime(i);
		
	}
	l.push_front(k);
}
int main()
{
	vector<int> v;
	fin >> n >> m;
	
	list<int>::iterator k;
	
	int i, j;
	while (fin >> i >> j)
	{
		a[i][j] = 1;
	}
	adancime(1);
	for (k = l.begin(); k != l.end(); k++)
		fout << *k<<" ";
}