#include <bits/stdc++.h>

using namespace std;

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

int n;
map<int, bool> f;

int main()
{
    int op, x;
    fin >> n;
    for (; n; --n) {
        fin >> op >> x;
        switch (op) {
            case 1: f[x] = 1; break;
            case 2: f[x] = 0; break;
            case 3: fout << int(f[x]) << '\n'; break;
        }
    }
    return 0;
}