import java.util.Scanner;
import java.util.List;
import java.util.ArrayList;
import java.util.Collections;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        
        int l = sc.nextInt();
        int n = sc.nextInt();
        
        List<Integer> list = new ArrayList<>();
        
        for (int i = 0; i < n; i++) {
            list.add(sc.nextInt());
        }

        Collections.sort(list);
        
        int i3 = 0;
        for (int w = 0; w < n; w++) {
            i3 += list.get(w);
                if (i3 >= l) {
                    System.out.println(w);
                    break;
                }
        }
    }
}