#include <map>
#include<fstream>
using namespace std;

int N, NR;
map <int, int> M;

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

    int i, tip, x;
    fin>>N;

    for (i = 1; i <= N; i++)
    {
        fin>>tip>>x;

        if (tip == 1 && M.find(x)==M.end()) M[x] = ++NR;
        if (tip == 2) M.erase(x);
        if (tip == 3) fout<<(M.find(x) != M.end())<<endl;
    }

    return 0;
}