#include <fstream>
#include <stdlib.h>

using namespace std;

ifstream fin("sortaret.in");
ofstream fout("sortaret.out");

int *A[50005], i, n, m, x, y, j;

int Stiva[50005], nr, Grad[50005], Valid[50005];

int main()
{
    fin>>n>>m;
    for (i=1; i<=n; i++)
    {
        A[i] = (int *) realloc(A[i], sizeof(int));
        A[i][0]=0;
    }
    for (i=1; i<=m; i++)
    {
        fin>>x>>y;
        A[x][0]++;
        A[x] = (int *) realloc(A[x],(A[x][0]+1)*sizeof(int));
        A[x][A[x][0]]=y;
        Grad[y]++;
    }
    for (i=1; i<=n; i++)
    {
        if (Grad[i]==0 && Valid[i]==0)
        {
            Valid[i]=1;
            fout<<i<<" ";
            for (j=1; j<=A[i][0]; j++)
            {
                Grad[A[i][j]]--;
            }
            i=1;
        }
    }
    return 0;
}