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

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

#define Nmax 50001

vector<int> graph[Nmax];

bool visited[Nmax];
vector<int> top;

void dfs(int x) {
    visited[x] = true;

    // parcurg vecinii y ai lui x
    for (int i = 0; i < graph[x].size(); i++) {
        int y = graph[x][i];
        if (!visited[y]) {
            dfs(y);
        }
    }

    top.push_back(x);
}

int main()
{
    int N, M, x, y, i;

    in >> N; // numarul de noduri
    in >> M; // numarul de arce (muchii)

    for (i = 0; i < M; i++) {
        in >> x >> y;
        // graf orientat
        graph[x].push_back(y);
    }

    dfs(1);

    for (i = top.size() - 1; i >= 0; i--) {
        out << top[i] << " ";
    }
    out << '\n';

    return 0;
}