#include<cstdio>
#include<set>
using namespace std;
#define FC(i) for(scanf("%d",&i);i;--i)
set<int > a;
int n,x,y;
int main()
{freopen("hashuri.in","rt",stdin);
 freopen("hashuri.out","wt",stdout);
 FC(n) 
    {scanf("%d%d",&x,&y);
     int exp=a.count(y);
	 switch(x)
		 {case 1 : a.insert(y);break;
		  case 2 : a.erase(y);break;
		  case 3 : if(exp>0) printf("1\n"); else printf("0\n");break;
		 }
	 }
 return 0;
}