#include <iostream>
#include <fstream>
#include <vector>
using namespace std;
ifstream in ("sortaret.in");
ofstream out("sortaret.out");
int const N=50001;
vector <int> v[N];
vector <int> coada;
int f[N];  int p;
void sol()
{
    int y;
    for(size_t i=0;i<coada.size();i++)
        for(int j=0;j<v[coada[i]].size();j++)
        {
            y = v[coada[i]][j];
            f[y]--;
            if(f[y]==0)
            {
                //f[v[coada[i]][j]]==false;
                out<<y<<" ";
                coada.push_back(y);
            }
        }
}
int main()
{
    int n,m,x,y;
    in>>n>>m;
    for(int i=1;i<=m;i++)
    {
        in>>x>>y;
        f[y]++;
        v[x].push_back(y);
    }
    for(int i=1;i<=n;i++)
        if(f[i]==false)
        {
            out<<i<<" ";
            coada.push_back(i);
        }
    sol();
    return 0;
}