#include <iostream>
#include <random>
#include <fstream>
#include <stack>
#include <bitset>
#include <unordered_map>
using namespace std;

ifstream fin("hashuri.in");
ofstream fout("hashuri.out");
unordered_map<int,bool> M;
int main() 
{
    int n;
    fin >> n;
    for (int i = 1; i <= n; i++)
    {
        int q;
        fin >> q;
        int x;
        fin >> x;
        if (q == 1)
            M[x] = 1;
        else if (q == 2)
            M[x] = 0;
        else
            fout << M[x] << '\n';
    }
    return 0;
}