#include <stdio.h>
#include <set>
#define MAX 306013
using namespace std;
FILE *fi, *fo;
int n;
int i,op,x,h;
set <int> H[MAX];
set <int> :: iterator it;
int main()
{
	fi=fopen("hashuri.in","r");
	fo=fopen("hashuri.out","w");
	fscanf(fi,"%d",&n);
	for (i=1;i<=n;i++)
	{
		fscanf(fi,"%d%d",&op,&x);
		if (op==1)
		{
			h=x%MAX;
			H[h].insert(x);
		}
		if (op==2)
		{
			h=x%MAX;
			H[h].erase(x);
		}
		if (op==3)
		{
			h=x%MAX;
			it=H[h].find(x);
			if (it==H[h].end())
				fprintf(fo,"0\n");
			else
				fprintf(fo,"1\n");
		}
	}
	fclose(fi);
	fclose(fo);
	return 0;
}