#include <fstream>
#include <vector>
using namespace std;
ifstream cin("sortaret.in");
ofstream cout("sortaret.out");
int n,m,i,viz[50002],sol[50001],val,x,y;
vector <int> v[50001];
void sortdfs(int i)
{
	int j;
	viz[i]=1;
	for (j=0;j<v[i].size();j++)
		if (!viz[v[i][j]]) sortdfs(v[i][j]);
	sol[++val]=i;
}
int main ()
{
	cin>>n>>m;
	for (i=1;i<=n;i++)
	{
		cin>>x>>y;
		v[x].push_back(y);
	}
	for (i=1;i<=n;i++)
		if (!viz[i]) sortdfs(i);
	for (i=n;i>=1;i--)
		cout<<sol[i]<<" ";
}