#include <iostream>
#include <fstream>
#include <cstring>
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <list>

#define MOD 66601
using namespace std;

class sett{
private:
	list<int> modLists[MOD];

public:
	sett(){
	}

	void add(int x){
		int pos = x % MOD;
		//cout << pos << endl;
		
		modLists[pos].push_back(x);
	}

	bool contains(int x){
		int pos = x % MOD;


  		for (list<int>::iterator it = modLists[pos].begin(); it != modLists[pos].end(); ++it)
   			 if (*it == x){
   			 	return true;
   			 }

  		return false;
	}

	void remove(int x){
		int pos = x % MOD;
		modLists[pos].remove(x);
	}
};

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

int main(){
	int n;
	f >> n;

	sett s;

	for(int i = 0; i < n; i++){
		int option, value;
		f >> option >> value;

		switch(option){
			case 1:
				s.add(value);
				break;
			case 2:
				s.remove(value);
				break;
			case 3:
				g << s.contains(value) << endl;
				break;
			default:
				cout << "f you :)" << endl;
		}
	}


	return 0;
}