MAX = int(input())
NUM = int(input())
blocks = list(input().split())
#print("blocks", blocks)
blocks_i = [int(s) for s in blocks]
blocks_i.sort()
#print("blocks_i", blocks_i)
n = 0
for i in range(NUM):
    MAX -= blocks_i[i]
    if MAX>=0: n += 1
#    print(i, blocks_i[i], MAX)
print(n)