#include <bits/stdc++.h>
using namespace std;

ifstream fin ("hashuri.in");
ofstream fout("hashuri.out");
int n,k,x,h,i;
vector <int> Hash[666013];

int cautare(int x)
{
    h = x % 666013;
    for(i=0;i<Hash[h].size();i++)
        if(Hash[h][i] == x)
            return 1;
    return 0;
}

void adaugare(int x)
{
    h = x % 666013;
    if(cautare(x) == 0)
        Hash[h].push_back(x);
}

void stergere(int x)
{
    h = x % 666013;
    for(int i=0;i<Hash[h].size();i++)
        if(Hash[h][i] == x)
        {
            Hash[h][i] = Hash[h][Hash[h].size()-1];
            Hash[h].pop_back();
            break;
        }
}

int main()
{
    fin>>n;
    for(i=1;i<=n;i++)
    {
        fin>>k>>x;
        if(k == 1)
            adaugare(x);
        else if(k == 2)
            stergere(x);
        else if(k == 3)
            fout<<cautare(x)<<"\n";
    }
    fin.close();
    fout.close();
    return 0;
}