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

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

#define MOD 666013

vector<int> H[MOD];

int hash_func(int x)
{
    return x % MOD;
}

bool caut(int x)
{
    int h = hash_func(x);
    for (auto it : H[h])
        if (it == x)
            return 1;
    return 0;
}

void insert_x(int x)
{
    int h = hash_func(x);
    if (caut(x) == 0)
        H[h].push_back(x);
}

void delete_x(int x)
{
    int h = hash_func(x);
    for (int i = 0; i < H[h].size(); ++i)
        if (H[h][i] == x)
        {
            H[h].erase(H[h].begin() + i);
            return ;
        }
}

int main()
{
    int n;
    fin >> n;

    for (int i = 1; i <= n; ++i)
    {
        int op, x;
        fin >> op >> x;
        if (op == 1)
            insert_x(x);
        else if (op == 2)
            delete_x(x);
        else
            fout << caut(x) << '\n';
    }
    return 0;
}