#include <fstream>
#include <vector>
using namespace std;

class InParser{
    private:
        vector < char > str;
        int position;
        ifstream fin;
 
        char GetChar(){
            if(position == (int) str.size()){
                fin.read(str.data(), position);
                position = 0;
            }
            return str[position++];
        }
 
        template < class DataType >
        DataType GetInteger(){
            char ch = GetChar();
            while( ! isdigit(ch) && ch != '-')
                ch = GetChar();
            int sgn = 1;
            if(ch == '-'){
                sgn = -1;
                ch = GetChar();
            }
            DataType number = 0;
            while(isdigit(ch)){
                number = number * 10 + ch - 48;
                ch = GetChar();
            }
            return sgn * number;
        }
    public:
        InParser(const string name): position(1e4), str(1e4), fin(name){}
        ~InParser(){
            fin.close();
        }
        template < class DataType >
        friend InParser& operator >> (InParser& in, DataType& number){
            number = in.GetInteger< DataType >();
            return in;
        }
};

const int MOD = 123457;
vector < int > H[MOD];

inline static void Add(int value){
    int key = value % MOD;
    for(auto x: H[key])
        if(x == value)
            return ;
    H[key].push_back(value);
}

inline static void Erase(int value){
    int key = value % MOD;
    int len = (int) H[key].size();
    for(int i = 0; i < len; ++i)
        if(value == H[key][i]){
            H[key][i] = H[key][len - 1];
            H[key].pop_back();
            return ;
        }
}

inline bool Find(int value){
    int key = value % MOD;
    for(auto x: H[key])
        if(x == value)
            return true;
    return false;
}

int main(){

    InParser fin("hashuri.in");
    ofstream fout("hashuri.out");
    int Queries, op, x;
    fin >> Queries;
    while(Queries--){
        fin >> op >> x;
        if(op == 1)
            Add(x);
        else if(op == 2)
            Erase(x);
        else
            fout << Find(x) << '\n';
    }

    return 0;
}