#include <iostream>
#include <vector>
#include <fstream>
#include <set>
#define NMAX 1000000
using namespace std;

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

vector<int> h[NMAX];

int add_to_set(int e)
{
    int hashvalue  = e%NMAX;
    for(auto x:h[hashvalue])
        if(x==e)
            return -1;
    h[hashvalue].push_back(e);
    return 1;
}

void sterge(int e)
{
    int hashvalue  = e%NMAX;
    for(unsigned int i=0; i<h[hashvalue].size(); i++)
        if(h[hashvalue][i]==e)
        {
            h[hashvalue].erase(h[hashvalue].begin()+i);
        }
}

void o_3(int e)
{
     int hashvalue  = e%NMAX;
    for(auto x:h[hashvalue])
        if(x==e)
        {
            fout<<1<<'\n';
            return;
        }
    fout<<0<<'\n';
}

int main()
{
    int n, o, x;
    fin>>n;
    while(n--)
    {
        fin>>o>>x;
        if(o==1)
            add_to_set(x);
        else if(o==2)
            sterge(x);
        else
            o_3(x);
    }
    return 0;
}