#include <iostream>
#include <fstream>
#include <vector>
using namespace std;
vector<int> H[70000];

void Add(int x)
{
    H[x % 70000].push_back(x);
}

void Delete(int x)
{
    int m = x % 70000;
    for (int i = 0; i < H[m].size(); i++)
        if(H[m][i] == x)
            H[m].erase(H[m].begin()+i);

}

int Search(int x)
{
    int m = x % 70000;
    for (int i = 0; i <H[m].size(); i++)
        if(H[m][i] == x)
            return 1;

    return 0;
}

int main()
{
    ifstream f("hashuri.in");
    ofstream g("hashuri.out");
    int n, op, x;
    f>>n;
    for(; n; n--)
    {
        f >> op >> x;
        if(op == 1)
            Add(x);
        else if(op == 2)
            Delete(x);
        else
            g << Search(x) << '\n';
    }

    return 0;
}