L = int(input())
N = int(input())
D = input()

blocks = D.split()
blocks.sort(key=int)

block_l = 0
block_c = 0

while L >= (block_l + int(blocks[block_c])):
    block_l = block_l + int(blocks[block_c])
    block_c = block_c + 1
    
print(block_c)