#include <cstdio>
#include <vector>
using namespace std;
FILE *f=fopen("sortaret.in","r");
FILE *g=fopen("sortaret.out","w");

const int NMAX = 50005;
const int MMAX = 100005;

vector<int> Muchii[NMAX];
vector<int> st;
int Sortat[50001];
int nrSort;

bool viz[NMAX];int n,m;
void read()
{

    fscanf(f,"%d%d",&n,&m);
    for(int i=1;i<=n;i++)
    {
        int x,y;
        fscanf(f,"%d%d",&x,&y);
        Muchii[x].push_back(y);
    }
}
void DFS(int nodCurent)
{
    viz[nodCurent] = 1;
    for(int i =0;i<Muchii[nodCurent].size();i++)
    {
        int vecin=Muchii[nodCurent][i];
        if(!viz[vecin])
        {
            DFS(vecin);
        }
    }
   // st.push_back(nodCurent);
    Sortat[++nrSort]=nodCurent;
}

int main()
{
    read();
    for(int i=1; i<=n; i++)
    {
        if(!viz[i])
            DFS(i);
    }
    for(int i=nrSort;i>=1;i--)
        fprintf(g,"%d ",Sortat[i]);

    fclose(f);
    fclose(g);
    return 0;
}