#include <bits/stdc++.h>

using namespace std;
int x,y,n,m,prd[50001],srt[50001],i,nd,j;
vector <int> mc[50001];
int main()
{
    freopen("sortaret.in","r",stdin);
    freopen("sortaret.out","w",stdout);
    scanf("%d%d",&n,&m);
    for(i=1;i<=n;i++)
    {
        scanf("%d%d",&x,&y);
        mc[x].push_back(y);
        prd[y]++;
    }
    for(i=1;i<=n;i++)
        if(!prd[i]) srt[++srt[0]]=i;
    for(i=1;i<=n;i++)
    {
        nd=srt[i];
        for(j=0;j<mc[nd].size();j++)
            {
                prd[mc[nd][j]]--;
                if(!prd[mc[nd][j]])
                srt[++srt[0]]=mc[nd][j];
            }
    }
    for(i=1;i<=n;i++)
        printf("%d ",srt[i]);
    return 0;
}