def main():

  sumed_list = []
  sumed_width = 0
  box_width = int(input())
  box_counts = int(input())
  each_box_width = list(map(int, input().split()))
  each_box_width_sort = sorted(each_box_width)
  # print(each_box_width_sort)
  for i in each_box_width_sort:
    if sumed_width < box_width:
      sumed_width += i
      sumed_list.append(sumed_width)
  # print(sumed_list)
  # print(sumed_width)
  print(len(sumed_list))

if __name__ == '__main__':
  main()