#include <fstream>
#include <map>
using namespace std;

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

map <int, int> Map;
int n, i, a, b, nr;
int main()
{
    fin >> n;
    for(i = 1; i <= n; i ++){
        fin >> a >> b;
        if(a == 1)
            {
                if(Map.find(b) == Map.end())
                    Map[b] = ++nr;
            }
        else
            if(a == 2)
            {
                Map.erase(b);
            }
            else
                fout << (Map.find(b) != Map.end()) << '\n';
    }
    return 0;
}