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

const string FILENAME = "hashuri";

ifstream fin(FILENAME + ".in");
ofstream fout(FILENAME + ".out");

int n;
unordered_map<int, bool> m;
int main()
{
	int op, x;
	fin >> n;
	while (n--)
	{
		fin >> op >> x;
		if (op == 1)
			m[x] = true;
		else if (op == 2) { if (m.find(x) != m.end()) m.erase(m.find(x));}
		else fout << ((m.find(x) != m.end()) ? "1\n" : "0\n");
	}
	fin.close();
	fout.close();
	return 0;
}