#pragma GCC optimize("Ofast")
#include <bits/stdc++.h>

typedef long long ll;

const ll mod=1e9+7;

const int dx[] = {0, 1, 0, -1};
const int dy[] = {1, 0, -1, 0};

#define all(x) x.begin(),x.end()
#define allr(x) x.rbegin(),x.rend()
#define rc(x)  return cout<<x<<"\n",0
#define sz(s)  (int) s.size()
#define pb push_back
#define mp make_pair
#define fr first
#define sc second
#define PI 3.14159265358979

using namespace std;

ll t;
ll nmax=2000000000;
int *hashmap = new int[nmax];
int main() {
ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	ifstream cin("hashuri.in");
	ofstream cout("hashuri.out");
	ll n;
	cin >> n;
	while (n--) {
		ll x,v;
		cin >> x;
		if (x==1) {
			cin >> v;
			hashmap[v]=1;
		}
		if (x==2) {
			cin >> v;
			hashmap[v]=0;
		}
		if (x==3) {
			cin >> v;
			if (hashmap[v]==1) {
				cout << "1\n";
			}
			else cout << "0\n";
		}
	}

}