#include <stdio.h>
FILE *f=fopen("sortaret.in","r"),*g=fopen("sortaret.out","w");

#define ALB 0
#define GRI 1
#define NEGRU 2
#define NMAX 50005

struct nod{
	int vf;
	nod* adr_urm;
	};

nod *l[NMAX],*adresa;
long int n,m;
short int color[NMAX];

void citire();
void adauga(int,int);
void sortare_topologica();
void DF(int);
void push(int);
void scrie();

int main(){
	citire();
	sortare_topologica();
	scrie();
	fclose(f);
	fclose(g);
	return 0;
	}

void citire(){
	fscanf(f,"%ld %ld",&n,&m);
	long int x,y;
	{
		;
		while(m>0)
		{{
				fscanf(f,"%ld %ld",&x,&y);
				adauga(x,y);
				}
			m--;
		}
	}

	}

void adauga(int i,int j){
	nod* p=new nod;
	p->vf=j;
	p->adr_urm=l[i];
	l[i]=p;
	}

void sortare_topologica(){
	int i;
	{
		i=1;
		while(i<=n)
		{{
				if(color[i]==ALB)
					DF(i);
				}
			++i;
		}
	}

	}

void DF(int i){
	color[i]=GRI;
	nod* p=l[i];
	{
		;
		while(p)
		{ 
			if(color[p->vf]==ALB)
				DF(p->vf);
			p=p->adr_urm;
		}
	}
	
	color[i]=NEGRU;
	push(i);
	}

void push (int i){
	nod *p=new nod;
	p->vf=i;
	p->adr_urm=adresa;
	adresa=p;
	}

void scrie(){
	{
		nod* p=adresa;
		while(p)
		{fprintf(g,"%d ",p->vf);
			p=p->adr_urm;
		}
	}
	
	}