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

using namespace std;

#define MOD  666013

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

int n;
vector<int> M[MOD];


inline vector<int>::iterator Cautare(int x)

{

    int list = x % MOD;

    vector<int>::iterator it;
    for (it=M[list].begin();it != M[list].end(); it++)
        if (*it == x)
            return it;

    return M[list].end();

}

inline void Inserare(int x)

{
    int list = x % MOD;

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


inline void Stergere(int x)

{
    int list = x % MOD;

    vector<int>::iterator it = Cautare(x);

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

}

int main()

{

    int 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\n";
        else fout<<"0\n";

    }


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

}