import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int box = sc.nextInt();
        int num = sc.nextInt();
        int[] width = new int[num];
        
        for(int i=0; i<num; i++){
            width[i] = sc.nextInt();
        }
        Arrays.sort(width);
        int tmp = 0;
        int r = 0;
        
        for(int n : width){
            tmp += n;
            if(box > tmp){
                r++;
            } else {
                break;
            }
        }
        System.out.println(r);
    }
}