#include<cstdio>
#include<vector>
#define p 666013
using namespace std;
void read(), solve();
vector<int> v[p];
int n,c,x,h;

int main()
{
	read();
	solve();
	return 0;
}
void read()
{
	freopen("hashuri.in","r",stdin);
	freopen("hashuri.out","w",stdout);
	scanf("%d",&n);
}
void solve()
{
	vector<int>::iterator it;
	for(;n;n--)
	{
		scanf("%d%d",&c,&x);
		h=x%p;
		for(it=v[h].begin();it!=v[h].end();it++)
			if(*it==x)
				break;
		if(c==1)
		{
			if(it==v[h].end())
				v[h].push_back(x);
			continue;
		}
		if(c==2)
		{
			if(it!=v[h].end())
			{
				*it=v[h].back();
				v[h].pop_back();
			}
			continue;
		}
		it==v[h].end()?printf("0\n"):printf("1\n");
	}
}