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


#define MOD  914239
vector<vector<int> >has(MOD);
vector<int> ::iterator find(int x)
{
    vector<int> :: iterator it;
    int list=x%MOD;
    for(it=has[list].begin();it!=has[list].end();it++)
        if(*it==x)return it;
    return has[list].end();
}

void add(int x)
{
    int list=x%MOD;
    if(find(x)==has[list].end())
        has[list].push_back(x);
}

int del(int x)
{
    int list = x % MOD;
    vector<int>::iterator it=find(x);
    if (it != has[list].end())
        has[list].erase(it);
}

int main()
{
    ifstream be("hashuri.in");
    ofstream ki("hashuri.out");
    int n;
    be>>n;

    for(int i=1;i<=n;i++)
    {
        int x,y;
        be>>x>>y;
        if(x==1){
            add(y);
        }
        if(x==2)del(y);
        if(x==3)
        {
            ki<<(find(y)!=has[y%MOD].end())<<endl;
        }
    }
    return 0;
}