#include <cstdio>
#include <map>

using namespace std;

int N;
map <int, int> M;

int main() {
  freopen("hashuri.in", "r", stdin);
  freopen("hashuri.out", "w", stdout);

    for (scanf("%d", &N); N; --N) {
      scanf("%d %d ", &tip, &x);

      if (tip == 1 && M.find(x) == M.end()) {
        M[x] = N;
        continue;
      }
      if (tip == 2) {
        M.erase(x);
        continue;
      }
      printf("%d\n", M.find(X) != M.end());
    }

  return 0;
}