import java.io.BufferedReader;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.PrintStream;
import java.util.ArrayList;

public class Main {
	 static ArrayList<Integer> [] adj;
	 static int[] visited ;
	 static ArrayList<Integer> sol;
	
	 public static void dfs(int n) {
		visited[n] = 1;
		for (Integer x : adj[n])
			if (visited[x] != 1)
				dfs(x);
		sol.add(n);
	}
	 
	public static void main(String[] args) throws IOException {
		 BufferedReader bf = new BufferedReader(new FileReader("sortaret.in"));
		 PrintStream out = new PrintStream(new FileOutputStream("sortaret.out"));
	     String tmp[] = bf.readLine().split(" ");
	     int n = Integer.parseInt(tmp[0]);
	     int m = Integer.parseInt(tmp[1]);
	      
		 adj = new ArrayList[n+1];
		 sol = new ArrayList<>();
		 for(int i=1;i<=n;i++) 
			 adj[i] = new ArrayList<Integer>();
		 
	     for (int i = 0; i < m; i++) {
           tmp = bf.readLine().split(" ");
           int x = Integer.parseInt(tmp[0]);
           int y = Integer.parseInt(tmp[1]);
           adj[x].add(y);
	     }
		 
		 visited = new int[n + 1];
		
		
				 dfs(0);
		
		 
		 for (int i = sol.size() -1 ;i >= 0 ;i--)
			out.print(sol.get(i)+" ");
		 out.println();
			out.close();
			bf.close();
		 
	}
}