#include <stdio.h>
#include <stdlib.h>
#include <iostream>
#include <cstring>
#include <fstream>
#include <algorithm>
#include <set>
#include <bitset>
#include <cmath>
#include <map>
#include <vector>
#include <queue>
#include <stack>
#define INF 1e9
#include <bits/stdc++.h>
using namespace std;
ifstream f("hashuri.in");
ofstream g("hashuri.out");
int main()
{
   set<int> mapa;
   int n;
   f>>n;
   while(n--)
   {
       int op , x;
       f>>op>>x;
       if(op == 1)
       {
           mapa.insert(x);
       }
       else if(op == 2)
       {
           mapa.erase(x);
       }
       else if(op == 3)
       {
           bool is = mapa.find(x) != mapa.end();
           if(is)g<<1;else g<<0;
           g<<'\n';
       }
   }
  return 0;
}