#include <bits/stdc++.h>

using namespace std;

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

vector<vector<int>> grph = vector<vector<int>>(100001);
vector<bool> viz = vector<bool>(100001,false);
vector<int> ord;


void dfs(int x){
    viz[x] = true;

    for (const auto &item: grph[x]) {
        if(viz[item] == false){
            dfs(item);
        }
    }
    ord.push_back(x);
}

int main(){
    int n,m;
    fin>>n>>m;

    for(int i=0;i<m;i++){
        int x,y;
        fin>>x>>y;
        grph[x].push_back(y);
    }
    dfs(1);

    for (const auto &item: ord) {
        fout<<item<<" ";
    }
}