#include <bits/stdc++.h>

using namespace std;

map<int, bool> hes;

int main()
{
    ifstream fin("hashuri.in");
    ofstream fout("hashuri.out");
    int n;
    fin >> n;
    for(int i = 1; i <= n; ++i){
        int op, x;
        fin >> op >> x;
        if(op == 1) hes[x] = 1;
        else if(op == 2) hes[x] = 0;
        else fout << hes[x] << "\n";
    }
    return 0;
}