#include <iostream>
#include <vector>
#include <fstream>
using namespace std;
ifstream f("hashuri.in");
ofstream g("hashuri.out");

#define k 666013

vector <int> myhash[k+5];

int main()
{
    int n, i, j, x, clasa, caz, poz, gasit;
    f>>n;
    for(i = 1; i <= n; i++){
        f>>caz>>x;
        gasit = 0;
        clasa = x % k;
        for(j = 0; j < myhash[clasa].size(); j++){
            if(myhash[clasa][j] == x){
                gasit = 1;
                poz = j;
                break;
            }
    }
    if(caz == 1){
        if(gasit == 0)
            myhash[clasa].push_back(x);

    }
    else{

    if(caz == 2){

        if(gasit == 1){
            swap(myhash[clasa][j], myhash[clasa].back());
            myhash[clasa].pop_back();
        }


    }else{

        if(gasit == 1)

            g<<1<<'\n';
        else
            g<<0<<'\n';

}}

}
    return 0;
}