box_size = int(input().rstrip())
nof_block = int(input().rstrip())
blocks = list(map(int, input().rstrip().split(' ')))

blocks.sort()

space_size = box_size
nof_in = 0
for i in range(nof_block):
    if space_size < blocks[i]:
        break
    space_size -= blocks[i]
    nof_in += 1

print(nof_in)