box_size = int(input())
block_num = int(input())
blocks = list(map(int, input().split()))
blocks.sort()

# print(box_size)
# print(block_num)
# print(blocks)

answer = 0
for block in blocks:
    box_size = box_size - block
    if box_size >= 0:
        answer += 1
    else:
        break

print(answer)