#include <fstream>
#include <map>

using namespace std;

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

map < int, int > M;

int n, a, b, i, nr;

int main()
{
    fin>>n;
    for (i=1; i<=n; i++)
    {
        fin>>a>>b;
        if (a==1 && M.find(b)==M.end())
            M[b] = ++nr;
        if (a==2)
            M.erase(b);
        if (a==3)
        {
            if (M.find(b)==M.end())
                fout<<0<<'\n';
            else
                fout<<1<<'\n';
        }
    }
    return 0;
}