#include<stdio.h>
#include<vector>
#include<utility>
#define P 666013
using namespace std;
int n;
vector<int> v[P];
FILE *fin,*fout;

void inserare(int x)
{
    int r=x%P,ok=0;
     for(vector<int>::iterator it=v[r].begin();it!= v[r].end();it++)
    {
        if(*it==x)
        {
            ok=1;
            *it++;
            return;
        }
    }
    if(ok==0)
    {
       v[r].push_back(x);
    }
}

void stergere(int x)
{
    int r=x%P;
    for(vector<int>:: iterator it=v[r].begin();it!=v[r].end();it++)
    {
        if(*it==x)
        {
            *it=*v[r].end();
            v[r].pop_back();
            return ;
        }
    }
}

void afiseaza(int x)
{
    fprintf(fout,"%d\n",x);
}

void cauta(int x){
    int r=x%P;
    for(vector<int>:: iterator it=v[r].begin();it!=v[r].end();it++)
    {
        if(*it==x)
        {
            afiseaza(1);
            return ;
        }
    }
    afiseaza(0);
}

void citire()
{
    int op,x;
    fin=fopen("hashuri.in","r");
    fscanf(fin,"%d",&n);
    for(int i=1;i<=n;i++)
    {
        fscanf(fin,"%d %d",&op,&x);
        if(op==1)
        {
            inserare(x);
        }
        else
        if(op==2)
        {
            stergere(x);
        }
        else
        {
            cauta(x);
        }
    }
}

int main()
{
    fout=fopen("hashuri.out","w");
    citire();
    return 0;
}