import java.util.*;

class Main{
    public static void main(String args[]){
        Scanner sc = new Scanner(System.in);
        int L = sc.nextInt();
        int N = sc.nextInt();
        int a[] = new int[N];
        int cnt = 0;
        for(int i = 0; i < N; i++){
          a[i] = sc.nextInt();
        }
        Arrays.sort(a);
        for(int j:a){
          L -= j;
          if(L < 0) break;
          cnt++;
        }
        System.out.println(cnt);
    }
}