#include <iostream>
#include <fstream>

using namespace std;

const unsigned FNV_offset_basis = 2166136261;
const unsigned FNV_prime = 16777619;

const unsigned NR = 20;
const unsigned MASK = ( 1 << 20 );

const int STERS = -1;

unsigned FNV( unsigned x )
{
    unsigned hsh = FNV_offset_basis;
    hsh = hsh ^ x;
    hsh = hsh * FNV_prime;
    return ( hsh & ( MASK - 1 ) );
}

unsigned HT[MASK];

void insert( int value )
{
    unsigned i;

    for ( i = FNV( value ); HT[i] != STERS && HT[i] != value; i = (i + 1) & ( MASK - 1 ) && i < MASK );

    HT[i] = value;
}

bool find( int value )
{
    unsigned i;

    for ( i = FNV( value ); HT[i] != STERS && HT[i] != value; i = (i + 1) & ( MASK - 1 ) && i < MASK );

    if ( i == MASK || HT[i] != value )
            return 0;
    else
            return 1;
}

void erase( int value )
{
    unsigned i;

    for ( i = FNV( value ); HT[i] != STERS && HT[i] != value; i = (i + 1) & ( MASK - 1 ) && i < MASK );

    HT[i] = STERS;
}

int N;
unsigned key, type;

const int DIM_BUFF = ( 1 << 20 );

char buffer[DIM_BUFF];
int position = DIM_BUFF;

char GetChar()
{
    if ( position == DIM_BUFF )
    {
        fread( buffer, 1, DIM_BUFF, stdin );
        position = 0;
    }

    return buffer[ position++ ];
}

unsigned rd()
{
    unsigned nr = 0;
    char c;

    do
    {
        c = GetChar();

    } while ( !isdigit( c ) );

    do
    {
        nr = nr * 10 + ( c - '0' );
        c = GetChar();

    } while ( isdigit( c ) );

    return nr;
}

int main()
{
    freopen("hashuri.in", "r", stdin);
    freopen("hashuri.out", "w", stdout);

    for ( int i = 0; i < MASK; ++i )
            HT[i] = STERS;

    N = rd();

    while ( N-- )
    {
        type = rd(); key = rd();

        if ( type == 1 ) insert( key );
        if ( type == 2 ) erase( key );
        if ( type == 3 ) printf("%d\n", find( key ) );
    }

    return 0;
}