/// hashuri map
#include <iostream>
#include <fstream>
#include <algorithm>
#include <map>
#include <utility>
#define NMax 1000001
#define f cin
#define g cout
using namespace std;

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

int n, x, cod;
map <int, bool> M; /// map<element, key>

int main()
{
    f >> n;
    for(int i = 1; i <= n; i++)
    {
        f >> cod >> x;
        if (cod == 1 && M.find(x)==M.end()) M[x] =1; /// verific daca codul e 1 si daca x mai exista in mapa.. il adaug pe x
        else if (cod == 2) M[x] = 0;
        else if (cod == 3) g << (M[x] == 1) << '\n';
    }
    return 0;
}