#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 st[nmax];

void dfs(int nod)
{
    viz[nod]=true;
    foor(it,G[nod]) if(!viz[*it]) dfs(*it);
    st[++st[0]]=nod;
}

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

    for(i=1;i<=n;++i) if(!viz[i]) dfs(i);
    for(;st[0];--st[0]) cout<<st[st[0]]<<' ';
    return 0;
    }