#include<fstream>
#include<vector>

using namespace std;
const int MOD = 666013;

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

    int op,x,N;
    fin>>N;
    for(int i=0;i<N;++i)
    {
        fin>>op>>x;
        if(op==1) {
            insert_value(x);
        }else if(op==2){
            erase_value((x));
        }
        else{
            fout<<(find_value(x)!=G[x%MOD].end())<<"\n";
        }
    }
    fin.close();
    fout.close();



    return 0;
}