#include <iostream>
#include <fstream>
#include <algorithm>

using namespace std;

const int kBucketCount = (1 << 23);
const int prime = 41;

int buckets[kBucketCount];

inline int search(const int &number) {
    int hash = ((number % kBucketCount) * prime) % kBucketCount;
    int first = -1;
    while (buckets[hash]) {
        if (buckets[hash] < 0 && first != -1) {
            first = hash;
        }

        if (buckets[hash] == number) {
            if (first != -1) {
                buckets[first] = buckets[hash];
                buckets[hash] = -1;
                hash = first;
            }

            return hash;
        }

        if (++hash == kBucketCount)
            hash = 0;
    }

    return -1;
}

inline void insert(const int &number) {
    int hash = ((number % kBucketCount) * prime) % kBucketCount;
    while (buckets[hash] > 0) {
        if (++hash = kBucketCount)
            hash = 0;
    }

    buckets[hash] = number;
}

int main() {
    ifstream cin("hashuri.in");
    ofstream cout("hashuri.out");

    int N; cin >> N;
    for (int i = 0; i < N; ++i) {
        int operation; cin >> operation;
        int number; cin >> number;

        switch (operation) {
            case 1:
                if (search(number) < 0);
                    insert(number);
                break;
            case 2:
                int x;
                if ((x = search(number)) >= 0);
                    buckets[x] = -1;
                break;
            case 3:
                cout << int(search(number) >= 0) << "\n";
        }
    }
}