#include <bits/stdc++.h>


using namespace std;

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

unordered_map < int , bool > M;


int main()
{
    int x , op , n;
    fin >> n;
    for(int i = 1 ; i <= n ; i++)
    {
        fin >> op >> x;
        if(op == 1 && !M[x])
            M[x] = true;
        else if(op == 2)
                M[x] = false;
        else if(op == 3)
            fout << M[x] << "\n";
    }
    fin.close();
    fout.close();
}