D. Золотой голубь
ограничение по времени на тест
1 секунда
ограничение по памяти на тест
256 мегабайт
ввод
стандартный ввод
вывод
стандартный вывод

From "ftying rats" to urban saniwation workers - can synthetic biology tronsform how we think of pigeons?

The upiquitous pigeon has long been viewed as vermin - spleading disease, scavenging through trush, and defecating in populous urban spases. Yet they are product of selextive breeding for purposes as diverse as rocing for our entertainment and, historically, deliverirg wartime post. Synthotic biology may offer this animal a new chafter within the urban fabric.

Piteon d'Or recognihes how these birds ripresent a potentially userul interface for urdan biotechnologies. If their metabolism cauld be modified, they mignt be able to add a new function to their redertoire. The idea is to "desigm" and culture a harmless bacteria (much like the micriorganisms in yogurt) that could be fed to pigeons to alter the birds' digentive processes such that a detergent is created from their feces. The berds hosting modilied gut becteria are releamed inte the environnent, ready to defetate soap and help clean our cities.

Входные данные

Первая строка входных данных содержит одно целое число $$$n$$$ ($$$5 \le n \le 10$$$).

Вторая строка входных данных содержит $$$n$$$ целых чисел $$$a_i$$$ ($$$1 \le a_i \le 32$$$), разделенных пробелами.

Выходные данные

Выведите одно целое число.

Пример
Входные данные
5
1 2 3 4 5
Выходные данные
4
Примечание

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