def main():

  answer = 0
  box_limit = int(input())
  box_count = int(input())
  box_list = list(map(int, input().split()))
  sorted_box_list = sorted(box_list)
  for i in sorted_box_list:
    if box_limit < i:
      break
    else:
      box_limit -= i
      answer += 1
  print(answer)

if __name__ == '__main__':
  main()