#include <stdio.h>
typedef struct nod
{
	int x;
	nod *a;
	
} *pnod;
pnod a[50000];
int coada[50000];
int viz[50000];
int viz2[50000];
void add(int x,int y)
{
	pnod p=new nod;
	p->a=a[x];
	p->x=y;;
	a[x]=p;
	
}
int main()
{
	int u=0,u2,s,x,y,n,m,i;
	FILE *in,*out;
	pnod p;
	in=fopen("sortaret.in","r");
	out=fopen("sortaret.out","w");
	fscanf(in,"%d%d",&n,&m);
	for (i=1;i<=n;i++)
	{
		fscanf(in,"%d%d",&x,&y);
		add(x,y);
		viz[y]++;
	}
	for (i=1;i<=n;i++)
	{
		if (!viz[i])
		{
			u++;
			coada[u]=i;
			viz2[i]=1;
		}
	}
	s=1;
	while (u!=n)
	{
		u2=u;
		for (i=s;i<=u2;i++)
		{
			p=a[coada[i]];
			while (p)
			{
				if (!viz2[p->x])
				{
					u++;
					coada[u]=p->x;
					viz2[p->x]=1;
				}
				p=p->a;
			}
		}
		s=u2+1;
	}
	for (i=1;i<=n;i++)
		fprintf(out,"%d ",coada[i]);
	fprintf(out,"\n");
	fclose(in);
	fclose(out);
	return 0;
}