#include <iostream>
#include <fstream>
#include <vector>
using namespace std;
 
ifstream fin("hashuri.in");
ofstream fout("hashuri.out");
 
int n;
const int mod = 666013;
vector<int> G[mod];
 
void Erase(const int nr)
{
    int poz = nr % mod;
    int lpoz = G[poz].size()-1;
 
    for (unsigned int i = 0; i < G[poz].size(); ++i)
        if ( G[poz][i] == nr )
        {
            swap(G[poz][i], G[poz][lpoz]); // swap found element with last element and
            G[poz].pop_back(); // pop
            return;
        }
}
 
bool Find(const int nr)
{
    int poz = nr % mod;
    vector<int>::iterator it;
    for (it = G[poz].begin(); it != G[poz].end(); ++it)
        if ( *it == nr ) return true;
    return false;
}
 
void Insert(const int nr)
{
    if ( Find(nr) ) return; 
    int poz = nr % mod;
    G[poz].push_back(nr);
}

int main()
{
    fin >> n;
 
    int op, nr;
    for(int i = 0; i < n; ++i)
    {
        fin >> op >> nr;
 
        if ( op == 1 ) Insert(nr);
        if ( op == 2 ) Erase(nr);
        if ( op == 3 ) fout << Find(nr) << '\n';
    }
 
    fout << '\n';
 
    fin.close();
    fout.close();
    return 0;
}