#include<iostream>
#include<vector>
#include<fstream>
using namespace std;
ifstream f("hashuri.in");
ofstream g("hashuri.out");
vector<int>L[1002];
int n,val;
void inserare(int val)
{
    int key=val%1001;
    L[key].push_back(val);
}
void stergere(int val)
{
    int key=val%1001;
    for(int i=0;i<L[key].size();i++)
    {
        if(L[key][i]==val)
        {
            L[key][i]=L[key][L[key].size()-1];
            L[key].pop_back();
        }
    }
}
int cautare(int val)
{
    int key=val%1001;
    for(int i=0;i<L[key].size();i++)
    {
        if(L[key][i]==val)
            return 1;
    }
    return 0;
}
void citire()
{
    f>>n;
    for (int i=1;i<=n;i++)
    {
        int cer;
        f>>cer;
        f>>val;
        if(cer==1)
        {
            if(cautare(val)==0)
                inserare(val);
        }
        else if(cer==2)
        {
            if(cautare(val)==1)
                stergere(val);
        }
        else if(cer==3)
        {
            if(cautare(val))
                g<<"1"<<"\n";
            else
                g<<"0"<<"\n";
        }
    }
}
int main()
{
    citire();
    return 0;
}