#include <cstdio>
#include <vector>
#define MOD 666013
using namespace std;
vector <int> H[MOD];
int n;
vector <int> :: iterator find_value(int x)
{
    vector<int> ::iterator it;
    int list=x%MOD;
    for(it=H[list].begin();it!=H[list].end();++it)
        if(*it==x)
            return it;
    return H[list].end();
}
void insert_value(int x)
{
    int list=x%MOD;
    if(find_value(x)==H[list].end())
        H[list].push_back(x);
}
void erase_value(int x)
{
    int list=x%MOD;
    vector <int> :: iterator it=find_value(x);
    if(it!=H[list].end())
        H[list].erase(it);
}
int main()
{
    freopen("hashuri.in","r",stdin);
    freopen("hashuri.out","w",stdout);
    int op,x;
    for(scanf("%d",&n);n;n--)
    {
        scanf("%d %d",&op,&x);
        if(op==1)
        {
            insert_value(x);
            continue;
        }
        if(op==2)
        {
            erase_value(x);
            continue;
        }
        printf("%d\n",H[x%MOD].end()!=find_value(x));
    }
    return 0;
}