#include <fstream>
#include <vector>
#define UNTIE ios::sync_with_stdio(0); fin.tie(0);

using namespace std;

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

vector<int> v[50002];
int vis[50002], sol[50002], len, n, m;

void DFS(int x)
{
    vis[x] = 1;
    for(auto w : v[x])
        if(vis[w] == 0)
        {
            sol[++len] = w;
            DFS(w);
        }

}

int main()
{
    UNTIE
    int i, j, x, y;
    fin >> n >> m;
    for(i = 1; i <= m; i++)
    {
        fin >> x >> y;
        v[x].push_back(y);
    }
    for(i = 1; i <= n; i++)
    {
        if(vis[i] == 0)
        {
            sol[++len] = i;
            DFS(i);
        }
    }
    for(i = 1; i <= len; i++)
        fout << sol[i] << " ";
    fin.close();
    fout.close();
    return 0;
}