lst = list()
lst.append("4")
lst.append("2")

while True:
    uid = input()

    if uid == "0":
        print(len(lst))
    elif uid == "1":
        print("Введите элемент для проверки")
        el = input()
        print(el in lst)
    elif uid == "e":
        break
    else:
        print("nothing")