#include <iostream>
#include <fstream>
#include <unordered_map>
using namespace std;

ifstream in("hashuri.in");
ofstream out("hashuri.out");

int n;
unordered_map<int, int> Map;

int main()
{
    in >> n;
    for (int i = 1, o, x; i <= n; ++i) {
        in >> o >> x;
        if (o == 1) {
            Map[x] = 1;
        } else if (o == 2) {
            Map[x] = 0;
        } else if (o == 3) {
            if (Map[x]) out << 1; else out << 0;
            out << "\n";
        }
    }

    return 0;
}