#include <bits/stdc++.h>
using namespace std;

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

int n;
vector<int> v;

int main()
{
    fin >> n;
    for(int i = 1; i <= n; ++i)
    {
        int op, x;
        int ok = 1;
        fin >> op >> x;
        if(op == 1)
        {
            for(int j = 0; j < (int) v.size(); ++j)
                if(v[j] == x){
                    ok = 0;
                    break;
                }
            if(ok)
                v.push_back(x);
        }
        if(op == 2)
        {
            for(int j = 0; j < (int) v.size(); ++j)
                if(v[j] == x){
                    v.erase(v.begin() + j);
                    break;
                }
        }
        if(op == 3)
        {
            ok = 0;
            for(int j = 0; j < (int) v.size(); ++j)
                if(v[j] == x){
                    ok = 1;
                    break;
                }
            fout << ok << '\n';
        }
    }
}