#include <iostream>
#include <fstream>

using namespace std;

ifstream in("hashuri.in");
ofstream out("hashuri.out");

const int N = 1000005, M = 666019;
int urm[N], lst[N], val[N];
int nr;

bool apartine(int x)
{
    int c = x % M;
    for(int p = lst[c]; p != 0; p = urm[p]){
        if(val[p] == x){
            return true;
        }
    }
    return false;
}

void adauga(int x)
{
    int c = x % M;
    if(apartine(x)){
        return;
    }
    val[++nr] = x;
    urm[nr] = lst[c];
    lst[c] = nr;
}

void sterge(int x)
{
    int c = x % M, p = lst[c];
    while(p != 0 && val[p] != x){
        p = urm[p];
    }
    if(p != 0){
        val[p] = val[lst[c]];
        lst[c] = urm[lst[c]];
    }
}

int main()
{
    int n;
    in >> n;
    while(n--){
        int code, x;
        in >> code >> x;
        if(code == 1)
            adauga(x);
        else if(code == 2)
            sterge(x);
        else{
            bool a = apartine(x);
            if(a == true){
                out << 1 << "\n";
            }
            else{
                out << 0 << "\n";
            }
        }
    }

    return 0;
}