use std::fs;
use std::io::{BufWriter, Write};
use std::collections::VecDeque;

fn main() {

    let file = fs::File::create("sortaret.out").unwrap();
    let mut writer = BufWriter::new(file);

    let input: String = fs::read_to_string("sortaret.in").unwrap();
    let mut tokens = input.split_whitespace();

    let mut next_num = || -> usize {
        tokens.next().unwrap().parse::<usize>().unwrap()
    };

    let n = next_num();
    let m = next_num();

    let mut grade: Vec<usize> = vec![0; n + 1];
    let mut g: Vec<Vec<usize>> = vec![Vec::new(); n + 1];
    for _ in 0..m {
        let (x, y) = (next_num(), next_num());
        g[x].push(y);
        grade[y] += 1;
    }

    let mut sol: Vec<usize> = Vec::with_capacity(n);

    for node in 1..=n {
        if grade[node] == 0 {
            sol.push(node);
        }
    }

    let mut head = 0;
    while head < sol.len() {
        let node = sol[head];
        head += 1;

        for &son in &g[node] {
            grade[son] -= 1;
            if grade[son] == 0 {
                sol.push(son);
            }
        }
    }

    for node in sol {
        write!(writer, "{} ", node).unwrap();
    }

}