#include <fstream>
#include <vector>
#include <algorithm>
using namespace std;

void visit(int, vector<int>*, vector<int>*, vector<int>[]);

int main(int argc, char **argv)
{
	// INPUT
	ifstream indata("sortaret.in");
	
	int n, m;
	indata >> n >> m;
	
	vector<int> edges[n];
	vector<int> unvisited;
	
	// input data
	int x, y;
	for (int i = 0; i < m; i++) {
		indata >> x >> y;
		// set edges
		edges[x - 1].push_back(y - 1);
	}
	for (int i = 0; i < n; i++) {
		// set unvisited nodes
		unvisited[i] = true;
	}
	
	indata.close();
	
	
	// OUTPUT
	ofstream outdata("sortaret.out");
	for (int i = 0; i < n; i++) {
		//outdata << (topologicalSort[i] + 1) << " ";
	}
	outdata.close();
	return 0;
}

void visit(int node, vector<int>* topologicalSort, vector<int>* unvisited, vector<int> edges[]) {
	vector<int>::iterator unvit = find((*unvisited).begin(), (*unvisited).end(), node);
	if (unvit != (*unvisited).end()) {
		(*unvisited).erase(unvit);
		
		for(vector<int>::iterator vit = edges[node].begin(); vit < edges[node].end(); vit++) {
			visit(*vit, topologicalSort, unvisited, edges);
		}
		
		(*topologicalSort).insert((*topologicalSort).begin(), 1, node);
	}
}