#include <bits/stdc++.h>

using namespace std;

const int mod = 666666;
vector<int> hash[mod];
ifstream f("hashuri.in");
ofstream g("hashuri.out");


void add(int x){
    int m = x % mod;
    for(int i = 0; i < hash[m].size(); i++){
        if(hash[m][i] == x)
            return;
    }

    hash[m].push_back(x);
}

void delete(int x){
    int m = x % mod;
    for (int i = 0; i < hash[m].size(); i++){
        if(hash[m][i] == x){
            hash[m].erase(hash[m].begin()+i)
            return;
        }
    }
}

int search(int x){
    int m = x % mod;
    for (int i = 0; i < hash[m].size(); i++){
        if(hash[m][i] == x){
            return 1;
        }
    }
    return 0;
}


int main()
{
    int n, x, y;
    f>>n;
    for(int i = 0; i < n; i++){
        f >> x >> y;
        switch(x){
            case 1:
                add(y);
                break;
            case 2:
                delete(y);
                break;
            case 3:
                cout << search(y);
                break;

        }
    }
    return 0;
}