include

include

include

include

using namespace std;

int main() { /* Enter your code here. Read input from STDIN. Print output to STDOUT */
int queries; cin >> queries; cin.ignore();

set<int> s;

for (int i = 0; i < queries; i++) {
    int type, num;

    cin >> type >> num;

    auto it = s.find(num);

    switch (type) {
        case 1:
            s.insert(num);
            break;
        case 2:
            s.erase(num);
            break;
        case 3:
            if (it != s.end() && *it == num) {
                cout << "Yes" << endl;
            } else {
                cout << "No" << endl;
            }
            break;
        default:
            break;
    }
}
return 0;

}