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

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

int main()
{
    int n,m;
    f>>n>>m;

    vector < vector <int> > Graph(n+1);
    vector <int> viz(n+1,0), G(n+1,0);
    queue <int> Q;

    for (int i=1;i<=m;i++)
    {
        int x,y;
        f>>x>>y;
        Graph[x].push_back(y);
        G[y]++;
    }
    for (int i=1;i<=n;i++)
    {
        if (G[i]==0)
        {
            Q.push(i);
            viz[i]=1;
        }
    }
    while(!Q.empty())
    {
        int nod=Q.front();
        Q.pop();
        g<<nod<<' ';
        for (auto j:Graph[nod])
        {
            if (viz[j]==0)
            {
                viz[j]=1;
                Q.push(j);
            }
        }
    }
    return 0;
}