use proconio::input;
fn main() {
    input! {
        capa:usize,
        n:usize,
        mut num:[usize;n],
    }
    num.sort();
    let mut lenge = 0;
    let mut count = 0;
    for i in 0..n{
        if lenge + num[i] >= capa{break}
        else {
            lenge += num[i];
            count += 1;
        }
    }
    println!("{}",count)
}