#include <fstream>
#include <set>

using namespace std;

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

set <int> s;
int i,q,x,n;
int main()
{
    fin>>n;
    for(i=0;i<n;i++)
    {
        fin>>q>>x;
        if (q == 1)
        {
            if (s.find(x) == s.end())
                s.insert(x);
        }
        else
            if(q == 2)
            {
                if (s.find(x) != s.end())
                    s.erase(s.find(x));
            }
            else
                if(q == 3)
                {
                    if (s.find(x) != s.end())
                        fout << "1\n";
                    else
                        fout << "0\n";
                }
    }
    return 0;
}