box_size = int(input())
box_cnt = int(input())
boxes = input()
boxes = [int(b) for b in boxes.split()]
boxes.sort()

for i,x in enumerate(boxes):
    box_size -= x
    if box_size < 0:
        print(str(i)+"\n")
        found = True
        break
if found == False:
    print(str(box_cnt)+"\n")