def get_max(my_size, my_list):
    sorted_list = sorted(my_list)
    i = 0
    total = 0
    while total <= my_size and i < len(my_list):
        total += sorted_list[i]
        i += 1
    return i-1


def main():
    box_size = int(input().strip())
    box_num = int(input().strip())
    box_list = list(map(int, input().strip().split()))
    print(get_max(box_size, box_list))

if __name__ == '__main__':
    main()