#include <iostream>
#include <cstdio>
#include <unordered_set>
using namespace std;

int main() {
	freopen("hashuri.in", "r", stdin);
	freopen("hashuri.out", "w", stdout);
	cin.tie(0);
	ios_base::sync_with_stdio(0);
	int n;
	cin >> n;
	unordered_set<int> s;
	for(int i=1;i<=n;i++) {
		int p, x;
		cin >> p >> x;
		if(p==1)
			s.insert(x);
		if(p==2)
			s.erase(x);
		if(p==3) {
			if(s.find(x)!=s.end())
				cout << "1\n";
			else
				cout << "0\n";
		}
	}
	return 0;
}