#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;
}