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

map<int, bool> mp;

int n;
int main() {
    fin >> n;
    for (int i = 1; i <= n; ++i) {
        int a, b;
        fin >> a >> b;
        if (a == 1) {
            mp[b] = 1;
        }
        else if (a == 2) {
            mp[b] = 0;
        }
        else {
            fout << mp[b] << '\n';
        }
    }
    fout.close();
    return 0;
}