#include <fstream>

using namespace std;
ifstream fin("hashuri.in");
ofstream fout("hashuri.out");

bool fr[1000001];

int main()
{
    int n;
    fin >> n;
    for(int i = 1; i <= n; ++i) {
        int op, x;
        fin >> op >> x;
        if(op == 1) {
            fr[x] = 1;
        }
        else if(op == 2) {
            fr[x] = 0;
        }
        else {
            fout << fr[x] << '\n';
        }
    }
    return 0;
}