#include<iostream>
#include<stdio.h>
#include<vector>
using namespace std;

vector<int> v;

int findPosition(vector<int> v, int x){
  bool ok = false;
  int n = v.size(), i = 0;
  while(i < n && ok == false){
    if(v[i] == x)
      ok = true;
    i++;
  }
  if(ok == false)
    return -1;
  else return (i - 1);
}

void add(int x){
  int found = findPosition(v, x);
  if(found == -1)
    v.push_back(x);
}

void removee(int x){
  int position = findPosition(v, x);
  if(position != -1)
    v.erase(v.begin() + position);
}

int main(){

  FILE *fin, *fout;
  fin = fopen("hashuri.in", "r");
  fout = fopen("hashuri.out", "w");

  int no, op;
  fscanf(fin, "%d", &no);

  for(int i = 0; i < no; i++){
    fscanf(fin, "%d", &op);

    int x;
    fscanf(fin, "%d", &x);
    switch(op){
      case 1: { add(x);
                break;
              }
      case 2: { removee(x);
                break;
              }
      case 3: { int res = findPosition(v, x);
                if(res == -1)
                  fprintf(fout, "0\n");
                else
                  fprintf(fout, "1\n");

                break;
              }
      default: {}
    }
  }
}