#include <fstream>
#include <cstring>
#include <iostream>
using namespace std;
ifstream f("hashuri.in");
ofstream g("hashuri.out");

const int size=2000001;

class Hashtable
{
    private:
        int v[size];
        
        int hash(int key)
        {
            return (key%size);
        }
    public:
        Hashtable()
        {
            memset(v,0,sizeof(v));
        }
        void insert(int key)
        {
            int h=hash(key);
            while(v[h]!=0 && v[h]!=-1 && v[h]!=key)
            {
                h++;
                if(h>=size) h=0;
            }

            if(v[h]==0 || v[h]==-1) v[h]=key;
        }

        bool lookup(int key)
        {
            int h=hash(key);
            while(v[h]!=0 && v[h]!=key)
                h++;
            if(v[h]==key) return 1;
            else return 0;
        }


        void remove(int key)
        {
			int h=hash(key);
			while(v[h]!=0 && v[h]!=key)
				h++;

			if(v[h]==key) v[h]=-1;
        }
}H;


int main()
    {
        int T,q,x;
        f>>T;
        while(T--)
        {
            f>>q>>x;
            switch (q)
            {
                case 1: H.insert(x); break;
                case 2: H.remove(x); break;
                case 3: g<<H.lookup(x)<<'\n';
            }
        }
		
		cout<<clock();
    }