/// Craciun Catalin
///  Hashuri
///   Arhiva educationala
///    www.infoarena.ro/problema/hashuri
#include <fstream>
#include <iostream>
#include <map>

using namespace std;

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

map<int, bool> H;

int main()
{
    long n;
    f>>n;
    for (long i=1;i<=n;i++)
    {
        short tip;
        long x;
        f>>tip>>x;
        if (tip==1)
        {
            if (H.find(x)==H.end())
                H[x]=1;
                
        }
        else if (tip==2)
        {
            H.erase(x);
        }
        else if (tip==3)
        {
            if (H.find(x)!=H.end())
                g<<1<<'\n';
            else
                g<<0<<'\n';
        }
    }

    f.close();
    g.close();

    return 0;
}