use std::io::*;
use std::str::FromStr;

fn get_line() -> String {
    let stdin = stdin();
    let mut line = String::new();
    stdin.lock().read_line(&mut line).expect("io error.");
    line.trim().to_string()
}

fn get_word<T: FromStr>() -> T {
    (&get_line()).parse().ok().expect("parse error.")
}

fn get_vec<T: FromStr>() -> Vec<T> {
    (&get_line()).split(' ').map(|x| x.parse().ok().expect("parse error.")).collect()
}

fn main () {
    let mut l = get_word::<i64>();
    get_word::<usize>();
    let mut wv = get_vec::<i64>();

    wv.sort();
    let mut ans: i64 = 0;
    for w in wv {
        l -= w;
        if l >= 0 {
            ans += 1;
        } else {
            break;
        }
    }

    println!("{}", ans);
}