#include<stdio.h>
#include<cstdio>
#include<vector>
#define mod 666013
using namespace std;
vector <int> h[mod];
void insert(int x)
{
	int rest=x%mod,ok=0;

	for(int i=0;i<h[rest].size();++i)
	{
		if(x==h[rest][i])
			ok=1;
	}
	if(ok==0)
	h[rest].push_back(x);
}
int caut(int x)
{
	int rest=x%mod;
		for(int i=0;i<h[rest].size();++i)
			if(x==h[rest][i])
				return 1;
		return 0;
}
void delete1(int x)
{
	int rest=x%mod;
	for(int i=0;i<h[rest].size();++i)
		if(x==h[rest][i])
			h[rest].pop_back();
}
int main()
{
	int n,op;
	int x;
	freopen("hashuri.in","r",stdin);
	freopen("hashuri.out","w",stdout);
	scanf("%d", &n);
	for(int i=0;i<n;++i)
	{
		scanf("%d %d",&op, &x);
		if(op==1)
			insert(x);
		else
			if(op==2)
				delete1(x);
			else
				printf("%d\n",caut(x));
	}
	return 0;
}