#include <stdio.h>
#include <vector>
 
using namespace std;
#define MOD 666013
 
int N;
vector<int> G[MOD];
 
inline vector<int>::iterator find_value(int x)
{
    int list = x % MOD;
    vector<int>::iterator it;
 
    for (it = G[list].begin(); it != G[list].end(); ++it)
        if (*it == x)
            return it;
    return G[list].end();
}
 
inline void insert_value(int x)
{
    int list = x % MOD;   
    if (find_value(x) == G[list].end())
        G[list].push_back(x);
}
 
inline void erase_value(int x)
{
    int list = x % MOD;
    vector<int>::iterator it = find_value(x);
     
    if (it != G[list].end())
        G[list].erase(it);
}
 
int main()
{
    int op, x;
     
    freopen("hashuri.in", "r", stdin);
    freopen("hashuri.out", "w", stdout);
 
    for (scanf("%d", &N); N; --N)
    {
        scanf("%d %d", &op, &x);
        if (op == 1) // inserare
        {
            insert_value(x);
            continue;
        }
        if (op == 2) // stergere
        {
            erase_value(x);
            continue;
        }
        printf("%d\n", find_value(x) != G[x % MOD].end());
    }
 
    return 0;
}