#include <iostream>
#include <fstream>
#include <unordered_map>

using namespace std;

ifstream f ("hashuri.in");
ofstream t ("hashuri.out");

typedef unordered_map <int,bool> int_hash;

int main()
{
    int_hash table;
    int n;
    f>>n;
    for (int type,target;n;--n){
        f>>type>>target;
        if (type==1)
            table.emplace(target,true);
        else if (type==2)
            table[target]=false;
        else if (type==3)
            t<<table[target]<<'\n';
    }
    return 0;
}