#include <fstream>
#include <map>
using namespace std;
ifstream fin("hashuri.in");
ofstream fout("hashuri.out");
map<int, bool> m;
int n, cer, x;
int main()
{
    fin >> n;
    for (int i = 1; i <= n; ++i)
    {
        fin >> cer >> x;
        if (cer == 1)
            m[x] = 1;
        else if (cer == 2)
            m[x] = 0;
        else fout << m[x] << '\n';
    }
    fin.close();
    fout.close();
    return 0;
}