#include <bits/stdc++.h>
#define MOD (1 << 21)
using namespace std;
vector <int> Hash[MOD];
int n;

class Reader
{
public:
    Reader() {}
    Reader(const char *file_name)
    {
        input_file = fopen(file_name, "r");
        cursor = 0;
        fread(buffer, SIZE, 1, input_file);
    }
    inline Reader &operator >>(int &n)
    {
        while(buffer[cursor] < '0' || buffer[cursor] > '9')
        {
            advance();
        }
        n = 0;
        while('0' <= buffer[cursor] && buffer[cursor] <= '9')
        {
            n = n * 10 + buffer[cursor] - '0';
            advance();
        }
        return *this;
    }

    inline Reader &operator >>(char &n)
    {
        while(!((buffer[cursor] >= 'a' && buffer[cursor] <= 'z') || (buffer[cursor] >= 'A' && buffer[cursor] <= 'Z') ))
        {
            advance();
        }

        if( (buffer[cursor] >= 'a' && buffer[cursor] <= 'z') || (buffer[cursor] >= 'A' && buffer[cursor] <= 'Z'))
        {
            n=buffer[cursor] ;
            advance();
        }
        return *this;
    }
private:
    FILE *input_file;
    static const int SIZE = 1 << 17;
    int cursor;
    char buffer[SIZE];
    inline void advance()
    {
        ++ cursor;
        if(cursor == SIZE)
        {
            cursor = 0;
            fread(buffer, SIZE, 1, input_file);
        }
    }
};

class Writer
{
public:
    Writer(const char *name):
        m_stream(name)
    {
        memset(m_buffer, 0, sizeof(m_buffer));
        m_pos = 0;
    }

    Writer& operator<<(int a)
    {
        int many = 0;
        do
        {
            digit_buffer[many++] = a % 10 + '0';
            a /= 10;
        }
        while (a > 0);
        for (int i = many - 1; i >= 0; --i)
            putchar(digit_buffer[i]);
        return *this;
    }

    Writer& operator<<(const char *s)
    {
        for (; *s; ++s)
            putchar(*s);
        return *this;
    }

    ~Writer()
    {
        m_stream.write(m_buffer, m_pos);
    }

private:
    void putchar(char c)
    {
        m_buffer[m_pos++] = c;
        if (m_pos == kBufferSize)
        {
            m_stream.write(m_buffer, m_pos);
            m_pos = 0;
        }
    }

    static const int kBufferSize = 1 << 17;
    ofstream m_stream;
    char m_buffer[kBufferSize];
    char digit_buffer[30];
    int m_pos;
};

int query(int x)
{
    auto it=find(Hash[x%MOD].begin(), Hash[x%MOD].end(),x);
    if (it != Hash[x%MOD].end()) return 1;
    return 0;
}

void addNumber(int x)
{
    if(query(x)==0) Hash[x%MOD].push_back(x);
}

void removeNumber(int x)
{
    auto it=find(Hash[x%MOD].begin(), Hash[x%MOD].end(),x);
    if (it != Hash[x%MOD].end()) Hash[x%MOD].erase(it);
}

Reader f("hashuri.in");
Writer g("hashuri.out");

int main()
{
    f>>n;
    for(int i=1;i<=n;i++)
    {
        int t,x;
        f>>t>>x;
        switch(t)
        {
            case 1:
                addNumber(x);
                break;
            case 2:
                removeNumber(x);
                break;
            case 3:
                g<<query(x)<<"\n";
                break;
        }
    }
}