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

int N,x,t;
unordered_map<int,bool> um;

int main(){
	ifstream cin("hashuri.in");
	ofstream cout("hashuri.out");
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cin >> N;
	while(N--){
		cin >> t >> x;
		if(t == 1)
			um[x] = 1;
		else if(t == 2) 
			um[x] = 0;
		else 
			cout << um[x] << '\n';
	}
}