l=int(input())
n=int(input())
*w,=map(int,input().split())
w.sort()

i=0
while i<=n:
	if sum(w[:i])>l:
		print(i-1)
		break
	elif sum(w[:i])==l:
		print(i)
		break
	i+=1
else:
	print(i)