#include <fstream>
#include <unordered_map>
using namespace std;
ifstream fin("hashuri.in");
ofstream fout("hashuri.out");

unordered_map<int, int> hashmap;
unordered_map<int, int>::iterator it;
int main()
{
    int choice, n;
    int element;
    fin >> n;
    for (unsigned i = 0; i < n; ++i)
    {
        fin >> choice >> element;
        switch (choice)
        {
        case 1:
            hashmap.insert(make_pair(element, 1));
            break;
        case 2:
            it = hashmap.find(element);
            if (it != hashmap.end())
                hashmap.erase(element);
            break;
        case 3:
            it = hashmap.find(element);
            if (it != hashmap.end())
                fout << 1 << '\n';
            else
                fout << 0 << '\n';
            break;
        default:
            break;
        }
    }
    return 0;
}