/*
https://infoarena.ro/problema/hashuri
*/
#include <fstream>

using namespace std;

const int N = 1e6;
const int M = 666019;
const int NIL = -1;

struct nod
{
    int info;
    int urm;
};

nod v_nod[N];
int lst[M], n_v_nod;

void init_liste()
{
    for (int i = 0; i < M; i++)
    {
        lst[i] = NIL;
    }
}

bool exista(int val)
{
    int c = val % M;
    int p = lst[c];
    while (p != NIL)
    {
        if (v_nod[p].info == val)
        {
            return true;
        }
        p = v_nod[p].urm;
    }
    return false;
}

void adauga(int val)
{
    if (exista(val))
    {
        return;
    }
    v_nod[n_v_nod].info = val;
    int c = val % M;
    v_nod[n_v_nod].urm = lst[c];
    lst[c] = n_v_nod++;
}

void sterge(int val)
{
    if (!exista(val))
    {
        return;
    }
    int c = val % M;
    int p = lst[c];
    while (v_nod[p].info != val)
    {
        p = v_nod[p].urm;
    }
    v_nod[p].info = v_nod[lst[c]].info;
    lst[c] = v_nod[lst[c]].urm;
}

int main()
{
    ifstream in("hashuri.in");
    ofstream out("hashuri.out");
    int n;
    init_liste();
    in >> n;
    for (int i = 0; i < n; i++)
    {
        int tip, val;
        in >> tip >> val;
        if (tip == 1)
        {
            adauga(val);
        }
        else if (tip == 2)
        {
            sterge(val);
        }
        else
        {
            out << exista(val) << "\n";
        }
    }
    in.close();
    out.close();
    return 0;
}