#include <fstream>
#include <vector>
#include <algorithm>
using namespace std;
ifstream fin("sortaret.in");
ofstream fout("sortaret.out");

int n,m;

const int sz = 50000;

vector <int> v[sz + 5];

bool viz[sz + 5];
vector <int> stk;



void top(int nod)
{
    viz[nod]=true;
    for(auto& i : v[nod]) if(!viz[i]) top(i);
    stk.push_back(nod);
}


int main()
{
    fin>>n>>m;
    for(int i=1;i<=m;i++)
    {
        int x,y;
        fin>>x>>y;
        v[x].push_back(y);
    }

    top(1);
    reverse(stk.begin(),stk.end());
    for(auto& i : stk) fout<<i<<' ';

}