#include <bits/stdc++.h>
using namespace std;

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

int n;
map <long long, bool> m;

int main()
{
    fin >> n;
    for (int tip, x; n; --n)
    {
        fin >> tip >> x;
        if (tip == 1) m[x] = 1;
        else if (tip == 2) m[x] = 0;
        else fout << m[x] << '\n';
    }
    return 0;
}