use proconio::input;

fn main() {
    input! {
        l: i32,
        n: usize,
        mut w: [i32; n],
    }
    w.sort();
    let mut sum = 0;
    for i in 0..n {
        sum += w[i];
        if sum >= l {
            println!("{}", i);
            return;
        }
    }
}