#include <fstream>
#include <vector>

using namespace std;

ifstream fin("hashuri.in");
ofstream fout("hashuri.out");

vector<int> nr[100001];

int H(int n)
{
	return n % 100000;
}

void adEl(int x)
{
	int hash = H(x);
	bool ok = true;
	for (int i = 0; i < nr[hash].size(); i++)
	{
		if (nr[hash][i] == x)
		{
			ok = false;
			break;
		}
	}
	if (ok)
	{
		nr[hash].push_back(x);
	}
}

void remEl(int x)
{
	int hash = H(x);
	for (int i = 0; i < nr[hash].size(); i++)
	{
		if (nr[hash][i] == x)
		{
			nr[hash].erase(nr[hash].begin() + i);
			break;
		}
	}
}

bool isEl(int x)
{
	int hash = H(x);
	for (int i = 0; i < nr[hash].size(); i++)
	{
		if (nr[hash][i] == x) return 1;
	}
	return 0;
}

int main()
{
	int n;
	fin >> n;
	int x, y;
	for (int i = 0; i < n; i++)
	{
		fin >> x >> y;
		if (x == 1) adEl(y);
		else if (x == 2) remEl(y);
		else fout << isEl(y) << '\n';
	}
}