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

using namespace std;

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

const int MOD = 797161;
vector<int> M[MOD];

vector<int>::iterator Cautare(int x)
{
    int list = x % MOD;

    for (auto it=M[list].begin();it != M[list].end(); it++)
        if (*it == x)
            return it;

    return M[list].end();
}

void Inserare(int x)
{
    int list = x % MOD;

    if (Cautare(x) == M[list].end())
        M[list].push_back(x);
}

void Stergere(int x)
{
    int list = x % MOD;

    auto it = Cautare(x);

    if (it != M[list].end())
        M[list].erase(it);
}


int main()
{
    int n,op,x;
    fin>>n;

    for (int i=0;i<n;i++)
    {
        fin>>op>>x;

        if (op == 1) Inserare(x);
        else if (op == 2) Stergere(x);
        else if (Cautare(x) != M[x % MOD].end())
            fout<<1<<endl;
        else fout<<0<<endl;
    }

    fin.close();
    fout.close();
    return 0;
}