wd = int(input())
num = int(input())
ls = input().split(" ")

bls = [int(i) for i in ls]
bls.sort()
sm = 0
count = 0
for i in bls:
    sm += i
    if sm < wd:
        count += 1
        continue
    elif sm == wd:
        count += 1
        break
print(count)