#include <fstream>
#include <vector>
using namespace std;
ifstream f("sortaret.in");
ofstream g("sortaret.out");
vector <int> G[100001];
int i,x,y,n,m,viz[50001],poz,a[50001];
void DFS(int nod){
    viz[nod]=1;
    for(i=0;i<G[nod].size();i++)
        if(viz[G[nod][i]]==0)
            DFS(G[nod][i]);
a[++poz]=nod;}

int main()
{
    f>>n>>m;
    for(i=1;i<=n;i++)
    {
        f>>x>>y;
        G[x].push_back(y);
    }
for(i=1;i<=n;i++)
    if(viz[i]==0)
        DFS(i);
        for(i=poz;i>=1;i--)
                g<<a[i]<<" ";
    return 0;
}