#include <bits/stdc++.h>
#define P 777013

using namespace std;
vector <int> h[P];

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

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

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 main()
{
    int i, o, n, N;
    fin >> N;
    for(i = 1; i <= N; i++)
    {
        fin >> o >> n;
        if(o == 1) Adauga(n);
        else if(o == 2) Sterge(n);
        else if(o == 3) fout << Cauta(n) << "\n";
    }
    fin.close();
    fout.close();
    return 0;
}