#include <fstream>
#include <vector>
#include <queue>

using namespace std;
ifstream cin("sortaret.in");
ofstream cout("sortaret.out");

#define MAXN 50005
vector<int> graf[MAXN];
queue<int> coada;

int n,m,x,y,i,j,nod;
int depinde[MAXN];

int main()
{
    cin>>n>>m;
    for(i=1; i<=m; i++)
    {
        cin>>x>>y;
        depinde[y]++;
        graf[x].push_back(y);
    }

    for(i=1; i<=n; i++)
        if(!depinde[i])
            coada.push(i);

    while(!coada.empty())
    {
        nod=coada.front(); coada.pop();
        if(!depinde[nod])
            cout<<nod<<" ";
        for(int i=0; i<graf[nod].size(); i++)
        {
            if(depinde[graf[nod][i]])
            {
                depinde[graf[nod][i]]--;
                coada.push(graf[nod][i]);
            }
        }
    }
}