#include <bits/stdc++.h>

using namespace std;

ifstream fin("sortaret.in");
ofstream fout("sortaret.out");

int n,m;
vector<int> g[50001];
list<int> ord;
bool viz[50001];
void dfs(int x)
{
    viz[x] = 1;
    for(int i : g[x])
        if(!viz[i])
            dfs(i);
    ord.push_front(x);
}
int main()
{
    int x, y;
    fin >> n >> m;
    for(int i = 1; i <= m; i++){
        fin >> x >> y;
        g[x].push_back(y);
    }
    dfs(1);
    for(int i : ord)
        fout << i << " ";
    return 0;
}