#include <iostream>
#include <fstream>
#include <map>
#include <unordered_map>
#include <string.h>

using namespace std;

int n, y, o;
unordered_map<int, bool> myMap;

char sir[15];
int idx;

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

void GetInt(int &t) {
    t = 0;
    while (isdigit(sir[idx])) {
        t *= 10;
        t += (int)sir[idx] - '0';
        idx++;
    }
    idx++;
}

int main()
{
    int i, j;
    fin >> n;
    fin.get();
    for (i = 1; i <= n; i++) {
        //fin >> o >> y;
        idx = 0;
        fin.getline(sir, 15);
        GetInt(o);
        GetInt(y);
        if (o == 1) {
            myMap[y] = true;
        } else if (o == 2) {
            myMap[y] = false;
        } else {
            fout << myMap[y] << '\n';
        }
    }
    return 0;
}