# include <fstream>
# define dim 50001
# include <vector>
using namespace std;
vector< vector < int > > mat( dim );
vector< int > v, grad( dim ), uz( dim );
int n,m;
inline void df( int x )
{
	if( grad[ x ] == 0 && ! uz[ x ] )
		uz[ x ] = 1, v.push_back( x );
	for(int i=0; i<mat[ x ].size(); ++i )
		grad[ mat[ x ][ i ] ] -- ,	df( mat[ x ][ i ] );
}
inline void citire()
{
	ifstream fin("sortaret.in");
	fin >> n >> m;
	for(; m; --m )
	{
		int x,y;
		fin >> x >> y;
		mat[ x ].push_back( y );
		grad[ y ]++;
	}
	for(int i=1; i<=n; ++i )
		if( grad[ i ] == 0 )
			df( i );
}
inline void afisare()
{
	ofstream fout("sortaret.out");
	for(int i=0; i<v.size(); ++i )
		fout << v[ i ] <<" ";
}	
int main()
{
	citire();
	afisare();
}