#include <cstdio>
#include <cassert>
#include <vector>

using namespace std;

#define MOD 999983

vector < int > h[MOD];

inline bool find( int x ) {
    int equiv = x % MOD;
    vector < int > :: iterator it = h[equiv].begin();
    while ( it != h[equiv].end() && *it != x )
        ++it;
    return ( it != h[equiv].end() && *it == x );
}

inline void insert( int x ) {
    if ( !find( x ) )
        h[x % MOD].push_back( x );
}

inline void erase( int x ) {
    int equiv = x % MOD;
    vector < int > :: iterator it = h[equiv].begin();
    while ( it != h[equiv].end() && *it != x )
        ++it;
    if ( it != h[equiv].end() && *it == x )
        h[equiv].erase( it );
}

int main() {
    FILE *fin, *fout;

    fin = fopen( "hashuri.in", "r" );
    int q;
    assert( fscanf( fin, "%d", &q ) == 1 );

    fout = fopen( "hashuri.out", "w" );
    while ( q ) {
        int type, val;
        assert( fscanf( fin, "%d%d", &type, &val ) == 2 );

        if ( type == 1 )
            insert( val );
        else if ( type == 2 )
            erase( val );
        else
            fprintf( fout, "%d\n", find( val ) ? 1 : 0 );

        --q;
    }

    fclose( fin );
    fclose( fout );
}