#include <fstream>
#include <iostream>
#include <set>
#include <vector>
#include <queue>
#include <algorithm>
using namespace std;

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

class Graph
{
private:
    int cntNodes;
    vector<set<int>> fromToList;
    vector<set<int>> toFromList;

public:
    Graph(int n)
    {
        cntNodes = n;
        for (int i = 0; i < n; ++i)
        {
            fromToList.push_back(set<int>());
            toFromList.push_back(set<int>());
        }
    }

    void addEdge(int from, int to)
    {
        fromToList[from].insert(to);
        toFromList[to].insert(from);
    }

    vector<int> topologicalSorting()
    {
        vector<int> queue;
        bool visited[cntNodes];
        fill(visited, visited + cntNodes, false);
        for (int i = 0; i < cntNodes; ++i)
        {
            if (fromToList[i].empty())
            {
                visited[i] = true;
                queue.push_back(i);
            }
        }
        int it = 0;
        while (it < queue.size())
        {
            int toNodeId = queue[it++];
            cout << toNodeId << "\n";
            for (int fromNodeId : toFromList[toNodeId])
            {
                if (!visited[fromNodeId])
                {
                    fromToList[fromNodeId].erase(toNodeId);
                    if (fromToList[fromNodeId].empty())
                    {
                        visited[fromNodeId] = true;
                        queue.push_back(fromNodeId);
                    }
                }
            }
        }
        reverse(queue.begin(), queue.end());
        return queue;
    }
};

int n, m, a, b, s;
int main()
{
    fin >> n >> m;
    Graph g(n);
    for (int i = 0; i < m; ++i)
    {
        fin >> a >> b;
        g.addEdge(a - 1, b - 1);
    }
    vector<int> r = g.topologicalSorting();
    for (int nodeId : r)
    {
        fout << nodeId + 1 << " ";
    }
    return 0;
}