#include <fstream>

using namespace std;
ifstream f("sortaretopologica.in");
ofstream g("sortaretopologica.out");
struct nod
{
    int val;
    nod *urm;
};
#define nmax 50010
typedef nod *pnod;
pnod v[nmax],p;
void ad(int x,int y)
{
    p=new nod;
    p->val=y;
    p->urm=v[x]->urm;
    v[x]->urm=p;
}
int t[nmax],s;
bool use[nmax];
void df(int inc)
{
    use[inc]=1;
    pnod p;
    p=v[inc]->urm;
    while(p)
    {
        if(!use[p->val])
            df(p->val);
        p=p->urm;
    }
    s+=1;
    t[s]=inc;
}
int main()
{
    int n,m,i,x,y;
    f>>n>>m;
    for(i=1;i<=n;i++)
    {
        v[i]=new nod;
        v[i]->urm=0;
    }
    for(i=1;i<=m;i++)
    {
        f>>x>>y;
        ad(x,y);
    }
    for(i=1;i<=n;i++)
    {
        if(use[i]==0)
        {
            df(i);
        }
    }
    for(i=s;i>=1;i--)
        g<<t[i]<<" ";
    return 0;
}