#include <iostream>
#include <fstream>
#include <unordered_set>


int main()
{
    std::ifstream fin("hashuri.in");
    std::ofstream fout("hashuri.out");

    int N;
    fin >> N;

    std::unordered_set<long long> set;

    for (; N; --N) {
        int type;
        long long nr;

        fin >> type >> nr;

        if (type == 1)
            set.emplace(nr);
        else if (type == 2 && set.count(nr))
            set.erase(set.find(nr));
        else if (type == 3)
            fout << (set.count(nr) ? "1" : "0") << std::endl;
    }

    fin.close();
    fout.close();

    return 0;
}