#include <fstream>
#include <vector>

using namespace std;

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

int main() {
    int n, i, x, y;
    vector <int> fr;
    f >> n;
    fr.resize(n + 5);
    for (i = 0; i < n; i++)
    {
        f >> x >> y;
        if (x == 1)
        {
            fr[y] = 1;
        }
        if (x == 2)
        {
            fr[y] = 0;
        }
        if (x == 3)
        {
            if (fr[y] == 1)
            {
                g << "1";
            }
            else
                g << "0";
        }
    }
    
}