#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cctype>
#include <cmath>
#include <string>
#include <algorithm>
#include <vector>
#include <queue>
#include <deque>
#include <set>
#include <stack>
#include <cassert>
using namespace std;

#define PRO "hashuri"
void OpenFiles(int EVAL)
{
	if(EVAL)
	{
		char input[100] = PRO, output[100] = PRO;
		freopen(strcat(input, ".in"),"r",stdin);
		freopen(strcat(output,".out"),"w",stdout);
	} else
	{
		freopen("test.in","r",stdin);
		//freopen("test.out","w",stdout);
	}
}

#define MAX  666013
#define INF 0xffffff
vector<int>h[MAX];

void add(int x)
{
	h[x%MAX].push_back(x);
}

int fnd(int x)
{
	int p = x%MAX;
	for(int i=0;i<h[p].size();i++)
		if(h[p][i]==x)return 1;
	return 0;
}

void rem(int x)
{
	int p = x%MAX;
	for(int i=0;i<h[p].size();i++)
		if(h[p][i]==x)h[p][i]=-1;
}

int main(int argv,char *args[])
{
	OpenFiles(argv==0);
	// start
	int n,op,x;
		scanf("%d",&n);
		for(int i=1;i<=n;i++)
		{
			scanf("%d %d",&op,&x);
			switch(op){
			case 1: add(x); break;
			case 2: rem(x); break;
			case 3: printf("%d\n",fnd(x)); break;
			}
		}
	return 0;
}