# Problem 5 - 数字のブロック

# input
L = int(input())
N = int(input())
w_nums = list(map(int, input().split()))

# initialization
w_nums = sorted(w_nums)
count = 0
w_sum = 0

for i in range(N):
    w_sum += w_nums[i]
    if w_sum>L:
        break
    else:
        count += 1

# output
print(count)