#include <bits/stdc++.h>

const std :: string FILENAME = "";

std :: ifstream in (FILENAME + ".in");

std :: ofstream out (FILENAME + ".out");

struct nod
{
    int fr = 0;

    nod * st = nullptr;

    nod * dr = nullptr;
};

int n;

int cer;

int x;

int y;

std :: string s;

std :: string to_string(int x)
{
    std :: string aux = "";

    while(x)
    {
        if(x % 2 == 1)
        {
            aux += '1';
        }
        else
        {
            aux += '0';
        }

        x /= 2;
    }

    while(aux.size() < 26)
    {
        aux += '0';
    }

    return aux;
}

void add(nod * & trie, int poz)
{
    trie -> fr ++;

    if(poz < s.size())
    {
        if(s[poz] == '0')
        {
            if(trie -> st == nullptr)
            {
                trie -> st = new nod;
            }

            add(trie -> st, poz + 1);
        }
        else
        {
            if(trie -> dr == nullptr)
            {
                trie -> dr = new nod;
            }

            add(trie -> dr, poz + 1);
        }
    }
}

void rem(nod * & trie, int poz)
{
    trie -> fr --;

    if(poz < s.size())
    {
        if(s[poz] == '0')
        {
            rem(trie -> st, poz + 1);
        }
        else
        {
            rem(trie -> dr, poz + 1);
        }
    }
}

int query(nod * trie, int poz)
{
    if(poz < s.size())
    {
        if(s[poz] == '0')
        {
            if(trie -> dr -> fr && trie -> st -> fr)
            {
                if(cnt )
            }
            else if(trie -> dr -> fr)
            {

            }
            else
            {

            }
        }
        else
        {
            if(trie -> st)
            {

            }
            else
            {

            }
        }
    }
}

int main()
{

    std :: ios_base :: sync_with_stdio(false);

    std :: cin.tie(NULL);

    nod * trie = new nod;

    std :: cin >> n;

    for(int i = 1; i <= n; i ++)
    {
        std :: cin >> cer;

        if(cer == 1)
        {
            std :: cin >> x;

            s = to_string(x);

            add(trie, 0);
        }
        else if(cer == 2)
        {
            std :: cin >> x;

            s = to_string(x);

            rem(trie, 0);
        }
        else
        {
            std :: cin >> x >> y;

            s = to_string(x);

            std :: cout << query(trie, 0) << '\n';
        }
    }

    return 0;
}