#include <fstream>

class HashTable
{
private:
	typedef struct Node
	{
		long long int value;
		Node* next;
	}Node;
	
	int m, size;
	Node** elems;

public:
	HashTable()
	{
		this->m = 23;
		this->size = 0;
		this->elems = new Node*[this->m]();
	}

	~HashTable()
	{
		for (int i = 0; i < this->m; i++)
		{
			Node* current = this->elems[i];
			while (current != nullptr)
			{
				Node* next = current->next;
				delete current;
				current = next;
			}
		}
		delete this->elems;
	}

	void add(int elem)
	{
		int bucket = this->hash(elem);
		Node* node = new Node;
		node->value = elem;
		node->next = nullptr;

		if (this->elems[bucket] == nullptr)
		{
			this->elems[bucket] = node;
			return;
		}

		Node* current = this->elems[bucket];

		while (current != nullptr)
			if (current->value == elem)
				return;
		node->next = this->elems[bucket];
		this->elems[bucket] = node;
	}

	void remove(int elem)
	{
		int bucket = this->hash(elem);
		Node* current = this->elems[bucket];
		Node* prev = nullptr;

		while (current != nullptr && current->value != elem)
			current = current->next;

		if (current == nullptr)
			return;

		if (prev == nullptr)
		{
			this->elems[bucket] = current->next;
			delete current;
			return;
		}
		prev->next = current->next;
		delete current;
	}

	int search(int elem)
	{
		int bucket = this->hash(elem);
		Node* current = this->elems[bucket];
		
		while (current != nullptr && current->value != elem)
			current = current->next;
		if (current == nullptr)
			return 0;
		return 1;
	}

private:
	int hash(int elem)
	{
		return elem % this->m;
	}

	/*
	void resize()
	{
		if (this->m != this->size)
			return;
		this->m *= 2;
		Node** newElems = new Node*[this->m];

		for (int i = 0; i < this->size; i += 1)
		{
			Node* current = this->elems[i];

			while (current != nullptr)
			{
				int bucket = this->hash.
			}
		}
		delete this->elems;
		this->elems = newElems;
	}
	*/
};

int main()
{
	HashTable hashTable = HashTable{};

	std::ifstream fin{ "hashuri.in" };
	std::ofstream fout{ "hashuri.out" };

	int commands;
	fin >> commands;

	for (int i = 0; i < commands; i++)
	{
		int command, number;
		fin >> command >> number;

		switch (command)
		{
		case 1:
		{
			hashTable.add(number);
			break;
		}
		case 2:
		{
			hashTable.remove(number);
			break;
		}
		case 3:
		{
			fout << hashTable.search(number)<<'\n';
			break;
		}
		default:
			break;
		}
	}
}