#include <iostream>
#include <fstream>
#include <vector>
using namespace std;

#define MAX_NR_NODURI 50000
#define VIZITAT 1

vector <int> nod[MAX_NR_NODURI];
long nr_muchii, nr_noduri;
int viz[MAX_NR_NODURI];

ifstream f("sortaret.in");
ofstream g("sortaret.out");

void dfs(long crt)
{
    viz[crt] = VIZITAT;
    g << crt << " ";
    long i, lg = nod[crt].size();
    for (i = 0; i < lg; i++)
        if (!viz[nod[crt][i]]){
            dfs(nod[crt][i]);
        }
}

int main ()
{
    long a, b;
    f >> nr_noduri >> nr_muchii;
    for (long i = 0; i < nr_muchii; i++) {
        f >> a >> b;
        nod[a].push_back(b);
    }
    f.close();

    for (long i = 1; i <= nr_noduri; i++) {
        if (!viz[i]) {
            dfs(i);
        }
    }
    g << "\n";

    g.close();
    return 0;
}