#1行目
width = int(input())

#2行目
blocknum = int(input())

#3行目
blocksize = input()
split_blocksize=blocksize.split()
blocksize_list = sorted(split_blocksize)

sum_blocksize = 0
inblock = 0
for n in range(blocknum - 1):
    sum_blocksize += int(blocksize_list[n])
    if sum_blocksize <= width:
        inblock += 1
    else:
        break
        
print(inblock)