#include <iostream>
#include <fstream>
#include <vector>


const int MOD = 666013;
class Hash {
private:
	std::vector<int> a[MOD];

public:
	Hash() {
	}

	void insert(int x) {
		int i = x % MOD;
		bool ok = false;
		for (int j = 0; j < a[i].size(); j++) {
			if (a[i][j] == x) {
				ok = true;
				break;
			}
		}
		if (ok == false) {
			a[i].push_back(x);
		}
	}
	void erase(int x) {
		int i = x % MOD;
		for (int j = 0; j < a[i].size(); j++) {
			if (a[i][j] == x) {
				a[i].erase(a[i].begin() + j);
				break;
			}
		}
	}
	bool has(int x) {
		int i = x % MOD;
		for (int j = 0; j < a[i].size(); j++) {
			if (a[i][j] == x) {
				return true;
			}
		}
		return false;
	}
};


std::ifstream f("hashuri.in");
std::ofstream g("hashuri.out");


Hash hash;


int main()
{
	int n;
	f >> n;
	for (int i = 1; i <= n; i++) {
		int op, x;
		f >> op >> x;

		if (op == 1) hash.insert(x);
		if (op == 2) hash.erase(x);
		if (op == 3) g << hash.has(x) << '\n';
	}


	f.close();
	g.close();
	return 0;
}