#include<vector>
#include<fstream>

using namespace std;

int main()
 {
	vector <int> v(1000000);
	int op,n,i,x;;
	FILE *f,*g;
	f=fopen("hashuri.in","r");
	g=fopen("hashuri.out","w");
	fscanf(f,"%d",&n);
	for(i=0;i<n;i++)
		{
			fscanf(f,"%d%d",&op,&x);
			if(op==1)
				v[x]=1;
			 else
				 if(op==2)
					 v[x]=0;
				  else
					  if(op==3)
						  if(v[x]==1)
							  fprintf(g,"1 \n");
						    else
								fprintf(g,"0 \n");
		}
	fclose(f);
	fclose(g);		
	
	return 0;
 }