#include <cstdio>
#include<vector>
#define prim   19583
using namespace std;

vector <int> v[prim];

int Search(int x){
int i=x%prim,d=0;
for (int j=0;j<v[i].size();j++)
    if (v[i][j]==x) d=1;
    if (d==0) return -1;
            else return  1;

}

void insert(int x){
 int i=x%prim,d=0,j1;
    for (int j=0;j<prim;j++)
    if (v[i][j]==x) d=1;
        if (d==0) v[i].push_back(x);


}

void del(int x){
int i=x%prim,d=0;
    for (int j=0;j<prim;j++){
    if (v[i][j]==x) {
    for(int k=j;k<v[i].size();k++)
        v[i][k]=v[i][k+1];
    };
    v[i].pop_back();
    }
}

int main(){
    int  n, key, op;
	freopen ("hashuri.in", "r", stdin);
	scanf("%d", &n);
	freopen("hashuri.out", "w", stdout);
    for (int i = 0; i < n; i++){
		scanf("%d %d", &op, &key);
		if (op == 1) insert(key);
		if (op == 2) del(key);
		if (op == 3) if (Search(key)== -1) printf("%d\n",0);
                        else printf("%d\n",1);

	}
}