use std::io::stdin;
pub fn main() {
    let line = || {
        let mut s = String::new();
        let _ = stdin().read_line(&mut s);
        s
    };
    let l: usize = line().trim().parse().unwrap();
    line();
    let mut ws: Vec<usize> = line().split_whitespace().flat_map(|x| x.parse()).collect();
    ws.sort();
    let mut sum = 0;
    let mut ct = 0;
    for w in ws {
        match sum + w {
            x if x == l => {
                ct += 1;
                break;
            }
            x if x > l => {
                break;
            }
            x => {
                sum = x;
                ct += 1;
            }
        }
    }
    println!("{}", ct);
}