import java.util.*;
import java.lang.*;
import java.io.*;

class Main{
    public static void main (String[] args) {
        Scanner sc = new Scanner(System.in);
        int wid = Integer.parseInt(sc.next());
        int num = Integer.parseInt(sc.next());
        List<Integer> box = new ArrayList<Integer>();
        for(int i = 0; i < num; i++){
            box.add(Integer.parseInt(sc.next()));
        }
        Collections.sort(box);
        int temp = 0;
        int ct = 0;
        for(Iterator it = box.iterator(); it.hasNext();){
            temp += ((Integer)it.next()).intValue();
            if(temp < wid) { ct++;  } else {break;}
        }
        System.out.println(ct);
    }
}