#include <bits/stdc++.h>
using namespace std; 
#define MAXN 50100
#define pb push_back
ifstream fin("sortaret.in");
ofstream fout("sortaret.out");
 
int N, M, viz[MAXN], deg[MAXN]; 
vector<int> G[MAXN];
 
void solve_and_write(void)
{
    int i, j, k;
 
    for(i = 1; i <= N; i++)
    {
        for(j = 1; j <= N; j++)
         if(!viz[j] && deg[j] == 0)
         {
            viz[j] = 1;
			fout<<j;
            for(k = 0; k < G[j].size(); k++)
                deg[ G[j][k] ]--;
            break ;
         }
    }
}
 
void read_data(void)
{
    int i, a, b;
    fin>>N>>M;
    for(i = 1; i <= M; i++)
        fin>>a>>b;
	G[a].pb(b);
	deg[b]++;
}
 
int main(void)
{

    read_data();
    solve_and_write();
 
    return 0;
}