#include <iostream> 
#include <fstream>
#include <vector>
using namespace std;

ifstream in("hashuri.in");
ofstream out("hashuri.out");

#define prime 500009
unsigned int n, op, x;
vector<int> h[prime];

void operatia1(int x); //adauga x
void operatia2(int x); //sterge x
int operatia3(int x); //cauta x

int main()
{
    
    
    in>>n;
    for (unsigned int i=0; i<n; i++)
    {
        in>>op>>x;
        if (op==1)
            operatia1(x);
        else if(op==2)
            operatia2(x);
        else out<<operatia3(x)<<"\n";

    }
    in.close();
    out.close();
    return 0;
}

int operatia3(int x) 
{
    int list = x % prime;
  
    for(unsigned int i = 0; i < h[list].size(); i++)
        if( h[list][i] == x )
            return 1;
    return 0;
}

void operatia1(int x)
{
    int list = x % prime;
    if(operatia3(x)==0)
        h[list].push_back(x);
    else
        return;
}

void operatia2(int x)
{
    int list = x % prime;
    for(unsigned int i = 0; i < h[list].size(); i++)
        {
            if (h[list][i]==x)
            {
            h[list].erase(h[list].begin()+i);
            break;
            }
        }
}