#include <iostream>
#include <vector>
#include <stdio.h>

using namespace std;

vector <int> *s,tpl;
int *viz;

void dfs(int x) {
    int i;
    for (i=0;(unsigned)i<s[x].size();i++) {
        if (!viz[s[x][i]]) {
            viz[s[x][i]] = 1;
            dfs(s[x][i]);
        }
    }
    tpl.push_back(x);
}

int main()
{
    int n,i,j,m,x;
    FILE *f,*g;
    f = fopen("sortaret.in","r");
    g = fopen("sortaret.out","w");
    fscanf(f,"%d %d",&n,&m);
    s = new vector<int>[n+1];
    viz = new int[n+1];
    for (i=1;i<=n;i++) viz[i] = 0;
    for (i=1;i<=m;i++) {
        fscanf(f,"%d %d",&x,&j);
        s[x].push_back(j);
    }
    fclose(f);
    dfs(1);
    for (i=tpl.size()-1;i>=0;i--) fprintf(g,"%d ",tpl[i]);
    fclose(g);
    return 0;
}