#include <stdio.h>
#include <vector>
#define NMAX 1000000
#define MOD 666013
using namespace std;
int v[NMAX];
vector <int> myHash[MOD];
void adauga( int x ) {
    int cod, i;
    cod = x % MOD;
    i = 0;
    while ( i < myHash[cod].size() && myHash[cod][i] != x )
        i++;
    if ( i == myHash[cod].size() )
        myHash[cod].push_back( x );
}
void sterge( int x ) {
    int cod, i;
    cod = x % MOD;
    i = 0;
    while  ( i < myHash[cod].size() && myHash[cod][i] != x )
        i++;
    if ( i < myHash[cod].size() )
        myHash[cod].erase( myHash[cod].begin() + i );
}
bool cauta( int x ) {
    int cod, i;
    cod = x % MOD;
    i = 0;
    while ( i < myHash[cod].size() && myHash[cod][i] != x )
        i++;
    return i < myHash[cod].size();
}
int main() {
    FILE *fin, *fout;
    int n, tip, x, i;
    fin = fopen( "hashuri.in", "r" );
    fout = fopen( "hashuri.out", "w" );
    fscanf( fin, "%d", &n );
    for ( i = 0; i < n; i++ ) {
        fscanf( fin, "%d%d", &tip, &x );
        if ( tip == 1 )
            adauga( x );
        else if ( tip == 2 )
            sterge( x );
        else
            fprintf( fout, "%d\n", cauta( x ) );
    }
    fclose( fin );
    fclose( fout );
    return 0;
}