#include<iostream>
#include<fstream>
#define NN 2500000
using namespace std;
void adauga(int x);
bool gaseste(int x);
void sterge(int x);
struct nod {
	int val;
	nod *next;
};

nod *h[NN];
int main(){
	freopen ("hashuri.in", "r", stdin);
	freopen ("hashuri.out", "w", stdout);
	int n, x, a;
	cin >> n;
	while (n--){
		cin >> a >> x;
		switch (a) {
			case 1: adauga(x); break;
			case 2: sterge(x); break;
			case 3: cout << gaseste(x) << '\n'; break;
		}
	}
}
void sterge(int x) {
	int v = x % NN;
	nod *q = h[v];
	if (q == NULL) return;
	if (q -> val == x) {
		h[v] = q -> next, delete(q);
	} else {
		nod *qq = q -> next;
		while(qq != NULL && qq -> val != x) {
			q = qq;
			qq = qq -> next;
		}
		if (qq != NULL) {
			q -> next = qq -> next;
			delete(qq);
		}
	}
}

bool gaseste(int x) {
	int v = x % NN;
	nod *q = h[v];
	while (q != NULL && q -> val != x) {
		q = q -> next;
	}
	if (q != NULL) return 1;
	return 0;
}

void adauga(int x) {
	int v = x % NN;
	if (h[v] == NULL) {
		h[v] = new nod;
		h[v] -> next = NULL;
		h[v] -> val = x;
	} else {
		nod *q = new nod;
		q -> val = x;
		q -> next = h[v];
		h[v] = q;
	}
}