#include <bits/stdc++.h>
using namespace std;
ifstream fin("hashuri.in");
ofstream fout("hashuri.out");
vector <int> meow;
int n, a, b;
int main()
{
    fin >> n;
    for (int i=1;i<=n;i++) {
        fin >> a >> b;
        if (a==1) meow.push_back(b);
        else if (a==2) {
            for (int h=1;h<=meow.size();h++)
                 if (meow[h]==b) {swap(meow[h],meow[meow.size()]); meow.pop_back(); h = h-1;}
        }
        else {
            if (find(meow.begin(),meow.end(),b)!=meow.end()) fout << 1 << '\n';
            else fout << 0 << '\n';
        }
    }
    return 0;
}