#include <bits/stdc++.h>
using namespace std;
int N,x,t;
unordered_map<int,bool> M;
int main()
{
	//ios_base::sync_with_stdio(0);cin.tie(0);
	ifstream cin("hashuri.in");
	ofstream cout("hashuri.out");
	cin >> N;
	//M.reserve(N);
	while(N--)
    {
		cin >> t >> x;
		if(t == 1)
            M[x]=1;
		else if(t == 2)
            M[x]=0;
		else
		cout << M[x] << '\n';
	}
}