#include <iostream>
#include <fstream>
#include <map>

using namespace std;

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


int main() {
    int n, x, op;
    map<int, int> m;
    fin >> n;
    for(int i=0; i<n; ++i)
    {
        fin >> op >> x;
        if (op == 1)
        {
            if(m.count(x) == 0)
                m[x] = 1;

        }

        else if (op == 2)
        {
            if(m.count(x) != 0)
                m.erase(x);
        }
        else
        {
            if( m.count(x)!= 0)
                fout << 1 << "\n";
            else
                fout << 0 << "\n";
        }


    }


    return 0;
}