#include<fstream>
#include<vector>
using namespace std;
#define hash 666013
vector<int> H[hash];
vector<int>::iterator cautare(int x){
	int lista=x%hash;
	vector<int>::iterator i;
	for(i = H[lista].begin();i!=H[lista].end();i++)
		if(*i==x) return i;
	return H[lista].end();
}
void insereaza(int x){
	int lista=x%hash;
	if(cautare(x)==H[lista].end())
		H[lista].push_back(x);
}
void stergere(int x){
	int lista=x%hash;
	vector<int>::iterator i=cautare(x);
	if(i!=H[lista].end())
		H[lista].erase(i);
}

int main(){
    freopen("hashuri.in", "r", stdin);
    freopen("hashuri.out", "w", stdout);
	int x,op,n;
	scanf("%d",&n);
	for(int i=0;i<n;i++){
		scanf("%d %d", &op, &x);
		if(op==1) {insereaza(x);continue;}
		if(op==2) {stergere(x);continue;}
		printf("d\n",(cautare(x) != H[x%hash].end()));
	}
	return 0;
}