include <fstream>
#include <unordered_map>
using namespace std;

int n, type, value, i;
int main()
{
	ifstream f("hashuri.in");
	ofstream g("hashuri.out");
	unordered_map <int, int> M;
	f >> n;
	for (i = 1;i <= n;++i)
	{
		f >> type >> value;
		if (type == 1)
			M[value]++;
		else
			if (type == 2)
				M.erase(value);
			else
				if (M[value] != 0)
					g << "1\n";
				else
					g << "0\n";


	}
	return 0;
}