#include <iostream>
#include <fstream>
#include <vector>
#define MAXN 50001
using namespace std;
ifstream f("sortaret.in");
ofstream g("sortaret.out");
int n,m,x,y,color[MAXN],nr,afis[50000];
vector <vector <int>> v(MAXN);
void sorttop (int cur)
{
    if (color[cur]==0)
    {
    color[cur]=1;
    for (int j=0; j<v[cur].size(); j++)
    {
        int next=v[cur][j];
        if (color[next]==0)
        {
            sorttop(next);
        }
        else if (color[next]==1)
        {
            return ;
        }
    }
    color[cur]=2;
    nr++;
    afis[nr]=cur;
    }
}
int main()
{
    f>>n>>m;
    for (int i=1; i<=m; i++)
    {
        f>>x>>y;
        v[x].push_back(y);
    }
    sorttop(1);
    for (int i=nr; i>=1; i--)
    {
        g<<afis[i]<<' ';
    }
    return 0;
}