#include <bits/stdc++.h>

using namespace std;

#define LIKELY(condition) __builtin_expect(static_cast<bool>(condition), 1)
#define UNLIKELY(condition) __builtin_expect(static_cast<bool>(condition), 0)

class parser {
public:
    parser() {}
    parser(const char *file_name)
    {
        input_file.open(file_name,ios::in | ios::binary);
        input_file.sync_with_stdio(false);
        index&=0;
        input_file.read(buffer,SIZE);
    }
    inline parser &operator >>(int &n)
    {
        for (; buffer[index]<'0' or buffer[index]>'9'; inc());
        n&=0;
        //sign&=0;
        //sign|=(buffer[index-1]=='-');
        for (; '0'<=buffer[index] and buffer[index]<='9'; inc())
            n=10*n+buffer[index]-'0';
        //n^=((n^-n)&-sign);
        return *this;
    }
    ~parser()
    {
        input_file.close();
    }
private:
    fstream input_file;
    static const int SIZE=0x400000; ///4MB
    char buffer[SIZE];
    int index/*,sign*/;
    inline void inc()
    {
        if(++index==SIZE)
            index=0,input_file.read(buffer,SIZE);
    }
};

class writer {
public:
    writer() {};
    writer(const char *file_name)
    {
        output_file.open(file_name,ios::out | ios::binary);
        output_file.sync_with_stdio(false);
        index&=0;
    }
    inline writer &operator <<(bool target)
    {
        aux&=0;
        /*sign=1;
        if (target<0)
            sign=-1;*/
        n=target;
        if (n==0)
            nr[aux++]='0';
        for (; n; n/=10)
            nr[aux++]=/*(sign**/n/*)*/%10+'0';
        /*if (sign==-1)
            buffer[index]='-',inc();*/
        for(; aux; inc())
            buffer[index]=nr[--aux];
        return *this;
    }
    inline writer &operator <<(const char *target)
    {
        aux&=0;
        while (target[aux])
            buffer[index]=target[aux++],inc();
        return *this;
    }
    ~writer()
    {
        output_file.write(buffer,index);
        output_file.close();
    }
private:
    fstream output_file;
    static const int SIZE=0x200000; ///2MB
    int index,aux,n/*,sign*/;
    char buffer[SIZE],nr[24];
    inline void inc()
    {
        if(++index==SIZE)
            index&=0,output_file.write(buffer,SIZE);
    }
};

parser f ("hashuri.in");
writer t ("hashuri.out");

template <class Tkey, class Tinfo>
class hashtable {
public:
    hashtable() {
        if (typeid(Tkey) == typeid(std::string))
            string_hash = true;
        else if (typeid(Tkey) == typeid(int))
            int_hash = true;
        else
            generic_hash = true;
    }; //C-TOR

    void add(Tkey target, Tinfo info) {
        set_index_to(target);

        while(true) {
            if (container[pointer].key == target) {
                occupied[pointer] = 2;
                return;
            } else if (occupied[pointer] < 2) {
                container[pointer].key = target;
                container[pointer].info = info;
            } else {
                inc();
            }
        }
    }

    void remov(Tkey target) {
        set_index_to(target);

        while(true) {
            if (container[pointer].key == target) {
                occupied[pointer] = 1;
                return;
            } else if (!occupied[pointer]) {
                return;
            } else {
                inc();
            }
        }
    }

    Tinfo find(Tkey target) {
        set_index_to(target);

        while(true) {
            if (container[pointer].key == target && occupied[pointer] == 2) {
                return container[pointer].info;
            } else if ((container[pointer].key == target && !occupied[pointer]) || !container[pointer].key) {
                return Tkey();
            } else {
                inc();
            }
        }
    }

    bool check(Tkey target) {
        set_index_to(target);

        while(true) {
            if (container[pointer].key == target && occupied[pointer] == 2) {
                return true;
            } else if ((container[pointer].key == target && !occupied[pointer]) || !container[pointer].key) {
                return false;
            } else {
                inc();
            }
        }
    }

    ~hashtable () {}//D-TOR

private:
    static const unsigned SIZE = 1048576, MOD = 1048575,
                     PRIME1 = 21313, PRIME2 = 19937, mask = 0xFFF00000;

    struct data_cell {
        Tkey key;
        Tinfo info;
    } container[SIZE];

    bool string_hash, int_hash, generic_hash;

    unsigned pointer;
    int_fast8_t occupied[SIZE];

    std::hash<Tkey> default_hsh;

    void inc()
    {
        if (UNLIKELY(++pointer == SIZE))
            pointer &= 0;
    }

    void integer_hash(int target) {
        pointer = target & MOD;
        pointer = (1LL * pointer * PRIME1) & MOD;
        pointer = (1LL  * pointer * PRIME2) & MOD;
        target |= mask;
        target >>= 16;
        pointer ^= target;
        pointer &= MOD;
    }

    void djb2(std::string target) {
        pointer = 5381;

        for (auto i : target)
            pointer = ((pointer << 5) + pointer) + i,
            pointer &= MOD;
    }

    void set_index_to(Tkey target) {
        if (string_hash)
            //djb2(target);
            pointer = default_hsh(target),
            pointer &= MOD;
        else if (int_hash)
            //integer_hash(target);
            pointer = default_hsh(target),
            pointer &= MOD;
        else
            pointer = default_hsh(target),
            pointer &= MOD;
    }
};

hashtable <int, bool> h;

void handle(int type, int target) {
    if (type == 1)
        h.add(target, true);
    else if (type == 2)
        h.remov(target);
    else
        t << h.check(target) << "\n";
}

int main() {
    int n;
    f >> n;
    for (int op, target; n; --n)
        f >> op >> target,
        handle(op, target);
}