#include <fstream>

using namespace std;
ifstream f("sortaret.in");
ofstream g("sortaret.out");
struct nod
{
    int inf;
    nod *urm;
};
nod *a[50006];
int v[50006],c[50006],nr,n,m;
void adauga(int i, int j)
{
    nod *p=new nod;
    p->inf=j;
   // p->cost=c;
    p->urm=a[i];
    a[i]=p;
}
void citire()
{
    int i,x,y;
    f>>n>>m;
    for(int i=1;i<=m;i++)
    {
        f>>x>>y;
        //v[y]++;
        adauga(x,y);
    }
}
void ad(int k)
{
    int i;
    v[k]=1;
    nod *q;
    q=a[k];
    while(q!=0)
    {
        if(v[q->inf]!=1)
            ad(q->inf);
        q=q->urm;
    }
    nr++;
    c[nr]=k;
}
int main()
{
    citire();
    for(int i=1;i<=n;i++)
        if(v[i]==0)
        ad(i);
    for(int i=nr;i>=1;i--)
        g<<c[i]<<" ";
    return 0;
}