#include <iostream>
#include<vector>
#include<fstream>
using namespace std;
 const int MOD = 666013;

 void insert(int x, vector<vector<int>>& v)
 {
     int fx = x % MOD;
     bool isThere = false;
     for(auto &elem: v[fx]) {
         if (elem == x)
             isThere = true;
     }
     if(!isThere)
     {
         v[fx].push_back(x);
     }
 }

 void erase(int x, vector<vector<int>>& v)
 {
     int fx = x % MOD;
     bool isThere = false;
     vector<int> aux;
     for(auto &elem: v[fx]) {
         if (elem == x)
             isThere = true;
         else
             aux.push_back(elem);
     }
     if(isThere)
     {
         v[fx] = aux;
     }
 }

 int find(int x, vector<vector<int>>& v)
 {
     int fx = x % MOD;
     bool isThere = false;
     for(auto &elem: v[fx]) {
         if (elem == x)
             isThere = true;
     }
     return isThere;
 }

int main() {
   vector<vector<int>> v(MOD);
   ifstream fin("hashuri.in");
   ofstream fout("hashuri.out");
   int N;
   fin>>N;
   for(int i = 0; i < N; i ++){
       int tip, x;
       fin>>tip>>x;
       if(tip == 1)
           insert(x, v);
       else if(tip == 2)
           erase(x, v);
       else
           fout<<find(x, v)<<"\n";
   }


    return 0;
}