#include <iostream>
#include <vector>
#include <stack>
#include <set>
#include <fstream>
#include <climits>
using namespace std;

int visited[50001];
int main()
{
	ifstream fin;
	ofstream fout;
	fin.open("sortaret.in");
	fout.open("sortaret.out");
	int nodeCount, edgeCount;
	vector<int> edges[50001];
	fin >> nodeCount >> edgeCount;
	for(int i=1;i<=edgeCount;i++)
	{
		int node1, node2;
		fin >> node1 >> node2;
		edges[node1].push_back(node2);
	}
	stack<int> st;
	stack<int> sorted;
	st.push(1);
	while(!st.empty())
	{
		int thisNode = st.top();
		int ok = 0;
		for(auto nextNode : edges[thisNode])
		{
			if(!visited[nextNode])
			{
				visited[nextNode] = 1;
				st.push(nextNode);
				ok = 1;
			}
		}
		if (ok == 0)
		{
			sorted.push(thisNode);
			st.pop();
		}
	}
	while(!sorted.empty())
	{
		fout << sorted.top()<<" ";
		sorted.pop();
	}
	return 0;
}