int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    set<int> s;
    int Q;
    cin >> Q;
    for (int i = 0; i < Q; i++) {
      pair<int, int> query;
      cin >> query.first >> query.second;
      int x = query.first;
      int y = query.second;
      if (x == 1) {
        s.insert(y);
      } else if (x == 2) {
        s.erase(y);
      } else if (x == 3) {
        set<int>::iterator it = s.find(y);
        it == s.end() ? cout << "No\n" : cout << "Yes\n";
      }
    }
    return 0;
}