max_num = int(input())
num = int(input())
blocks = input().split()
blocks_size = [int(i) for i in blocks]
blocks_size.sort()

count = 0
blocks_sum = 0
for i in blocks_size:
    blocks_sum += i
    if blocks_sum <= max_num:
        count += 1
    else:
        break
print(count)