# include <fstream.h>
ifstream f("hashuri.in");
ofstream g("hashuri.out");
int n,o,x;
bool c[1990299999];
int main()
{
	f>>n;
	while(n)
	{
		n--;
		f>>o>>x;
		switch (o){
		case 1: c[x]=true;
				break;
		case 2:c[x]=false;
		break;
		case 3: if(c[x]==true)g<<1<<'\n';
			else 
				
				g<<0<<'\n';
				break;
		}
	}
	f.close();
	g.close();
	return 0;
}