def get_max(my_size, my_list):
    sorted_list = sorted(my_list)
    i = 0
    total = 0
    while total <= my_size:
        if i >= len(my_list):
            return i
        else:
            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()