#include<iostream>
#include<fstream>
#include<unordered_map>
using namespace std;
	ifstream fin("hashuri.in");
	ofstream fout("hashuri.out");
int main() {

	int n,i,op,nr;
	unordered_map<int, int> hash;
	fin>>n;
	for (i=0; i<n; i++){
		fin>>op>>nr;
		if (op == 1)
            {if (hash.count(nr) == 0)
                {hash[nr] = 1;}}

		else if (op == 2) {
                if (hash.count(nr) == 1)
                    {hash.erase(nr);}}

		else if (op == 3)
            {if (hash.count(nr) !=0)
                {fout << "1" << endl;}
			else
                {fout << "0" << endl;}
            }
	}
	fin.close();
	fout.close();
}