#include <fstream>
#include <iostream>
#include <stdio.h>
#include <unordered_map>
using namespace std;

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

unordered_map <int, int> mMap;
int queries;

int main()
{
    int type, param;
    fin >> queries;
    for(int i = 0 ; i < queries; i++)
    {
        fin >> type >> param;
        if(type == 1)
            mMap[param] = 1;
        if(type == 2)
            mMap.erase(param);
        if(type == 3)
        {
            if(mMap.find(param) != mMap.end())
                fout << 1 << "\n";
            else
                fout << 0 << "\n";
        }
    }

    return 0;
}