#include <bits/stdc++.h>
using namespace std;

ifstream fin("hashuri.in");
ofstream fout("hashuri.out");

unordered_map<int, bool> fr;

int main()
{
    int n, x, p;
    fin >> n;
    while(n--)
    {
        fin >> p >> x;
        if(p == 1) 
            fr[x] = 1;
        if(p == 2) 
            fr[x] = 0;
        if(p == 3)
            fout << fr[x] << "\n";
    }
    return 0;
}