using namespace std;
#include<fstream>
ifstream eu("hashuri.in");
ofstream tu("hashuri.out");
# define Mod 666013
#include<vector>
vector <int> G[Mod];
int N,x,op;

vector <int>:: iterator look_for(int val)
{
	int list=x%Mod;
	vector<int>:: iterator it;
	for(it=G[list].begin();it!=G[list].end();it++)
		if(*it==x)
			return it;
		return G[list].end();
}



void Add(int val)
{
	int list=x%Mod;
	if(look_for(x)==G[list].end())
		G[list].push_back(x);
}


void Del(int val)
{
	int list=x%Mod;
	vector<int>:: iterator it;
	it=look_for(x);
	if(look_for(x)!=G[list].end())
		G[list].erase(it);
}


int main()
{
	eu>>N;
	while(N--)
	{
		eu>>op>>x;
		if(op==1)
			Add(x);
		else
			if(op==2)
				Del(x);
			else
			{
				if(look_for(x)!=G[x%Mod].end())
					tu<<"1\n";
				else
					tu<<"0\n";
			
			}
	}
	return 0;
}