#include<fstream.h>

ifstream citeste("hashuri.in");
ofstream scrie("hashuri.out");

struct nod{
	int inf;
	nod *adr;
} *p,*u,*c;

int cauta(int x){
	if (p->inf==x) return 1;
	c=p;
	while (c->adr){
		c=c->adr;
		if (c->inf==x) return 1;
	}
	return 0;
}

void adauga(int x){
	if (!cauta(x)){
		c=new nod;
		c->inf=x;
		c->adr=0;
		if (p==0) p=c;
			else u->adr=c;
		u=c;
	}
}

void sterge(int x){
	nod *d;
	if(cauta(x)){
		c=p;
		while(c->adr){
			d=c;c=c->adr;
			if (c->inf==x){
				d->adr=c->adr;
				delete c;
				break;
			}
		}
	}
}


void citire(){
	int x,y;
	citeste>>x>>y;
	if (x==1) adauga(y);
		else if (x==2) sterge(y);
			else if (x==3) scrie<<cauta(y)<<endl;

}

int main(){
	int n;
	citeste>>n;
	for (int i=1;i<=n;i++)
		citire();
	return 0;
}