#include <fstream>

const int P = 666013;

using namespace std;

struct element
{
    int info;
    element *next;
};

class hash_table
{
    element *q;

    public:
        //int size;

        hash_table();
        //bool empty();
        element* first();
        element* last();
};

hash_table::hash_table()
{
    q = new element;
    q->info = 0;
    q->next = NULL;
}

/*bool hash_table::empty()
{
    if (size)
        return false;
    return true;
}*/

element* hash_table::first()
{
    return q;
}

element* hash_table::last()
{
    element *p;
    p=q;
    while (p->next != NULL)
        p=p->next;
    return p;
}

class hash
{
    hash_table *tables;

    public:
        hash();
        element* find(int);
        void insert(int);
        void erase(int);
};

hash::hash()
{
    tables = new hash_table[P];
}

element* hash::find(int x)
{
    element *p;
    int table = x%P;
    p = tables[table].first();
    while (p->next != NULL)
    {
        if (p->next->info == x)
            return p;
        p = p->next;
    }
    return NULL;
}

void hash::insert(int x)
{
    element *p,*newnode;
    int table = x%P;
    if ((*this).find(x) != NULL)
        return;
    p = tables[table].last();
    newnode = new element;
    newnode->info = x;
    newnode->next = NULL;
    p->next = newnode;
    //tables[table].size++;
}

void hash::erase(int x)
{
    element *p, *q;
    int table = x%P;
    if ((p=(*this).find(x)) != NULL)
    {
        q = p->next;
        p->next = p->next->next;
        delete q;
        tables[table].size--;
    }
}


int main()
{
    int n,op,x;
    ifstream f("hashuri.in");
    ofstream g("hashuri.out");

    hash H;
    f>>n;
    for (int i=0; i<n; ++i)
    {
        f>>op>>x;
        if (op==1)
           H.insert(x);
        if (op==2)
           H.erase(x);
        if (op==3)
           g<<(H.find(x)!=NULL)<<'\n';
    }

    return 0;
}