#include <fstream>
#include <vector>

#define MOD 777013

using namespace std;

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

vector<int> H[MOD];

void adauga(int x)
{
    int i = x%MOD;
    vector<int>::iterator it;
    for(it = H[i].begin(); it != H[i].end(); ++it)
        if(*it == x) return;
    H[i].push_back(x);
}

void sterge(int x)
{
    int i = x%MOD;
    vector<int>::iterator it;
    for(it = H[i].begin(); it != H[i].end(); ++it)
        if(*it == x)
        {
            H[i].erase(it);
            return;
        }
}

int main()
{
    int n, op, x;
    fin >> n;
    for(int i = 1; i <= n; ++i)
    {
        fin >> op >> x;
        if(op == 1) adauga(x);
        else if(op == 2) sterge(x);
        else
        {
            int i = x%MOD;
            bool ok = 0;
            vector<int>:: iterator it;
            for(it = H[i].begin(); it != H[i].end(); ++it)
                if(*it == x)
                {
                    fout << "1\n";
                    ok = 1;
                }
            if(!ok) fout << "0\n";
        }
    }
    return 0;
}