#include <fstream>
#include <vector>
using namespace std;
ifstream cin("sortaret.in");
ofstream cout("sortaret.out");

void rezolvare(vector<int> data[], int n,int ex[500],int i=1){
    if(i<=n){
        if(!ex[i]){
             ex[i]++; cout<<i<<" "; rezolvare(data,n,ex,i);
           }
        else if(data[i].size()>1){
            vector<int>::iterator it=data[i].begin();
            while(it!=data[i].end()){
                rezolvare(data,n,ex,*it);
                ++it;
            }
        }
    }
}

int main(){
    int n,m,a,b,ex[n],j=1;
    cin>>n>>m;
    vector<int> data[n];
    for(int i=1;i<=m;i++){
        cin>>a>>b; data[a].push_back(b);
    }
    rezolvare(data,n,ex,j);
    for(int i=1;i<=n;i++){
        if(ex[i]!=1)
            cout<<i<<" ";
    }
    return 0;
}