#include <bits/stdc++.h>
#define P 123457

using namespace std;

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

vector <int> h[P];
int n;

void Adauga (int x)
{
    int r;
    r = x % P;
    for (auto w : h[r])
        if (w == x) return;
    h[r].push_back(x);
}

void Sterge (int x)
{
    int r, L, i;
    r = x % P;
    L = h[r].size();
    for (i = 0; i < L; i++)
        if (x == h[r][i])
        {
            h[r][i] = h[r][L - 1];
            h[r].pop_back();
            return;
        }
}

int Cauta (int x)
{
    int r;
    r = x % P;
    for (auto w : h[r])
        if (w == x) return 1;
    return 0;
}

int main()
{
    int i, op, x;
    fin >> n;
    for (i = 1; i <= n; i++)
    {
        fin >> op >> x;
        if (op == 1)
            Adauga(x);
        else if (op == 2)
            Sterge(x);
        else
            if (Cauta(x))
                fout << "1\n";
            else
                fout << "0\n";
    }

    return 0;
}