l = int(input())
n = int(input())
w = [int(i) for i in input().split()]
max_num = 0
r_num = 2**n
for i in range(1,r_num+1):
    s = bin(i)[2:].zfill(n)
    k_num = 0
    pr_num = 0
    for j, f_num in zip(list(s), range(n)):
        if j == "1":
            k_num += w[f_num]
            pr_num += 1
        if k_num > l:
            break
    if k_num <= l and max_num < pr_num:
        max_num = pr_num
print(max_num)