#include <stdio.h>
#include <map>
#define MOD 666013

using namespace std;

int n, nr;
map <int, int> M;

int main()
{
	int i, op, x;

	freopen("hashuri.in", "r", stdin);
	freopen("hashuri.out", "w", stdout);

	scanf("%d ", &n);

	for (i = 1; i <= n; i++){
		scanf("%d%d ", &op, &x);

		if (op == 1 && M.find(x)==M.end())
            M[x] = ++nr;
		if (op == 2)
            M.erase(x);
		if (op == 3){
            if(M.find(x) != M.end()) printf("1\n");
            else printf("0\n");
		}
	}

	return 0;
}