#include <fstream.h>
#include <iostream.h>
#include <vector>
#define M 45053

ifstream f("hashuri.in");
ofstream g("hashuri.out");

using namespace std;
vector<int> H[M];
int P=45053;

vector<int>::iterator hCheck(int x);

int main()
{
	int n,i,op,x;
	
	f>>n;
	
	for(i=1;i<=n;i++)
	{
		f>>op>>x;
		if(op==1)
		{
			if(hCheck(x)==H[x/P].end())
				H[x/P].push_back(x);
		}
		else
			if(op==2)
			{
				vector<int>::iterator c=hCheck(x);
				if(c!=H[x/P].end())
					H[x/P].erase(c);
			}
			else
				if(hCheck(x)!=H[x/P].end())
					g<<1<<"\n";
				else
					g<<0<<"\n";
	}
	
	f.close();
	g.close();
	return 0;
}

vector<int>::iterator hCheck(int x)
{
	vector<int>::iterator c;
	for(c=H[x/P].begin();c!=H[x/P].end();++c)
		if(*c==x)
			return c;
	return H[x/P].end();
}