box_width = int(input())
block_num = int(input())
block_width_list = [int(x) for x in input().split(' ')]

cnt = 0
block_total_width = 0
for block_width in sorted(block_width_list):
	block_total_width += block_width
	if block_total_width > box_width:
		break
	else:
		cnt += 1
print(cnt)