length = int(input())
number = int(input())
box_list = list(map(int, input().split()))
box_list.sort()
total_length = 0
for i, j in enumerate(box_list):
    total_length += j
    if total_length <= length:
        if i +1 == len(box_list) and i + 1 <= number:
            print(str(i + 1))
            break
        else:
            continue
    else:
        print(str(i))
        break