#include <iostream>
#include <vector>
#include <fstream>
using namespace std;
ifstream fin("sortaret.in");
ofstream fout("sortaret.out");
int const nLim = 50005;
vector < int > Arce[nLim];
bool vizitat[nLim];
int n, m;

void DFS(int i) {
    vizitat[i] = true;
    for(unsigned int j = 0; j < Arce[i].size(); j ++) {
        int next = Arce[i][j];
        if(!vizitat[next]) {
            fout << next << " ";
            DFS(next);
        }
    }

}

void citire() {
    fin >> n >> m;
    for(int i = 1; i <= m; i ++) {
        int x, y;
        fin >> x >> y;
        Arce[x].push_back(y);
    }
    fout << "1 ";
    for(int i = 1; i <= n; i ++) {
        if(!vizitat[i])
            DFS(i);
    }
}

int main() {
    citire();
    return 0;
}