#include <iostream>
#include <fstream>
#include <vector>

using namespace std;

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

int N, op, x, i;
vector<int> v[666013];

inline vector<int>::iterator find_value(int x)
{
    int list = x % 666013;
    for (vector<int>::iterator it = v[list].begin(); it != v[list].end(); ++it)
        if (*it == x)
            return it;
    return v[list].end();
}

inline void insert_value(int x)
{
    int list = x % 666013;
    if (find_value(x) == v[list].end())
        v[list].push_back(x);
}

inline void erase_value(int x)
{
    int list = x % 666013;
    vector<int>::iterator it = find_value(x);
    if (it != v[list].end())
        v[list].erase(it);
}

int main()
{
    f>>N;
    for(i=0;i<N;i++)
    {
        f>>op>>x;
        if (op==1)
        {
            insert_value(x);
            continue;
        }
        if (op==2)
        {
            erase_value(x);
            continue;
        }
        if(op==3)
            g<<(find_value(x) != v[x%666013].end())<<"\n";
    }

    return 0;
}