#include <bits/stdc++.h>

using namespace std;

#ifdef INFOARENA
ifstream f("sortaret.in");
#define cout g
#else
ifstream f("date.in");
#endif // INFOARENA

ofstream g("sortaret.out");

#define nmax 50001
#define foor(it,v) for(__typeof(v.begin()) it=v.begin();it!=v.end();++it)
vector <int> G[nmax];

int n,m,i,x,y;
bool viz[nmax];
int gr[nmax],nod;
int q[nmax],iq,sq;


int main()
    {
    f>>n>>m;
    for(;m;--m)
    {
        f>>x>>y;
        G[x].emplace_back(y);
        ++gr[y];
    }

    for(i=1;i<=n;++i) if(gr[i]==0)
    {
    q[++sq]=i;
    viz[i]=true;
    }
    iq=1;
    while(iq<=sq)
    {
        nod=q[iq++];
        for(auto vec:G[nod])
            if(!viz[vec])
        {
            --gr[vec];
            if(gr[vec]==0)
            {
                viz[vec]=true;
                q[++sq]=vec;
            }
        }
    }
    for(i=1;i<=sq;++i) cout<<q[i]<<' ';
    return 0;
    }