#include <iostream>
#include <fstream>
#include <unordered_map>

using namespace std;

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

unordered_map <int, bool> HASH;

int main()
{
    int n, op, x;
    fin >> n;
    while(n--){
        fin >> op >> x;
        switch(op){
        case 1:
            HASH[x] = true;
            break;
        case 2:
            HASH[x] = false;
            break;
        case 3:
            fout << HASH[x] << "\n";
            break;
        default:
            break;
        }
    }
    return 0;
}