#include<fstream>
using namespace std;
#define nmax 50010
ifstream f("sortaret.in");
ofstream g("sortaret.out");
struct nod
{
	int nr;
	nod *adr;
} *asc[nmax],*desc[nmax];
int n,m,ok[nmax],urc[nmax];
void citire()
{
	int a,b;
	f>>n>>m;
	for(int i=1;i<=m;i++)
	{
		f>>a>>b;
		nod *p=new nod;
		p->nr=b;
		p->adr=desc[a];
		desc[a]=p;
		p=new nod;
		p->nr=a;
		p->adr=asc[b];
		asc[b]=p;
	}
}
void rez(int x)
{
	nod *p;
	if(asc[x]!=NULL && ok[x]==0)
	{
		urc[x]=1;
		for(p=asc[x];p!=NULL;p=p->adr)
			if(ok[p->nr]==0)
				rez(p->nr);
	}
	g<<x<<' ';
	ok[x]=1;
	for(p=desc[x];p!=NULL;p=p->adr)
		if(urc[p->nr]==0)
			rez(p->nr);
}
int main()
{
	citire();
	for(int i=1;i<=n;i++)
		if(ok[i]==0)
			rez(i);
	return 0;
}