#include <iostream>
#include <fstream>
#include <vector>

std::vector<std::vector<int>>adiacenta;
std::vector<int> sortare;
std::vector<bool>vizitat;
int n, m;

void citire()
{
	int x, y;
	std::ifstream f("sortaret.in");
	f >> n >> m;
	adiacenta.resize(n + 1);
	vizitat.resize(n + 1, false);
	for (int i = 1; i <= n; i++)
	{
		f >> x >> y;
		adiacenta[x].push_back(y);
	}
}

void DFS(int nod)
{
	if (vizitat[nod] == false)
	{
		sortare.push_back(nod);
		vizitat[nod] = true;
		for (int i = 0; i < adiacenta[nod].size(); i++)
		{
			if (vizitat[adiacenta[nod][i]] == false)
			{
				DFS(adiacenta[nod][i]);
			}
		}
	}
}

void afisare()
{
	std::ofstream g("sortaret.out");
	for (int i = 0; i < sortare.size(); i++)
	{
		g << sortare[i] << " ";
	}
		
}

int main()
{
	citire();
	for (int i = 1; i <= n; i++)
	{
		if (vizitat[i] == false)
		{
			DFS(i);
		}
	}
	afisare();


	return 0;
}