#include <bits/stdc++.h>

using namespace std;
ifstream fin("sortaret.in");
ofstream fout("sortaret.out");
vector<int> v[100001];
int vc[50001];
void f(int i)
{
    vc[i]=1;
    fout<<i<<" ";
    int j,m=v[i].size();
    for(j=0;j<m;j++)
    {
        if(vc[v[i][j]]==0)
        {
            vc[v[i][j]]=1;
            f(v[i][j]);
        }
    }
}
int main()
{
    int n,m,i,a,b,j;
    fin>>n>>m;
    for(i=1;i<=m;i++)
    {
        cin>>a>>b;
        v[a].push_back(b);
    }
    for(i=1;i<=n;i++)
    {
        if(vc[i]==0)
        {
            vc[i]=1;
            f(i);
        }
    }
    return 0;
}