#include <bits/stdc++.h>

using namespace std;

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

int T, p, x;
unordered_map <int,int> m;

int main()
{
    in >> T;

    while(T--)
    {
        in >> p >> x;

        if(p == 1)
        {
            m[x] = 1;
        }
        else if(p == 2)
        {
            m[x] = 0;
        }
        else
            out << (m[x] ? 1 : 0) << '\n';
    }
    return 0;
}