#include <iostream>
#include <fstream>

using namespace std;

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

const int MOD = 666019;
const int dim = 1000005;

int val[dim],urm[dim],lst[MOD],nr,n,op,x;

bool Exista(int x)
{
    int categ = x%MOD;
    for (int p=lst[categ]; p!=0; p=urm[p])
    {
        if (val[p] == x)
        {
            return 1;
        }
    }
    return 0;
}

void Adauga(int x)
{
    if (Exista(x)) return ;
    int categ = x%MOD;
    val[++nr] = x;
    urm[nr] = lst[categ];
    lst[categ] = nr;
}

void Sterge(int x)
{
    if (!Exista(x)) return ;
    int categ = x%MOD;
    int p = lst[categ];
    if (x == val[p])
    {
        lst[categ] = urm[p];
        return ;
    }
    while (urm[p] != 0)
    {
        if (val[urm[p]] == x)
        {
            urm[p] = urm[urm[p]];
            return ;
        }
        p = urm[p];
    }
}

int main()
{
    in >> n;
    while (n--)
    {
        in >> op >> x;
        if (op == 1) Adauga(x);
        if (op == 2) Sterge(x);
        if (op == 3) out << Exista(x) << "\n";
    }
    return 0;
}