#include <iostream>
#include<unordered_map>
#include<string>
#include<fstream>
using namespace std;
ifstream in("hashuri.in");
ofstream out("hashuri.out");
unordered_map<string,int> a;
void add(int p)
{
    string x=to_string(p);
    a[x]=p;
}
void erasex(int p)
{
    a.erase(to_string(p));
}
bool contains(int p)
{
    string c=to_string(p);
    std::unordered_map<std::string,int>::const_iterator got = a.find (c);
    return got!=a.end();
}
int main()
{
    int n,a,b;
    in>>n;
    for(int i=0; i<n; i++)
    {
        in>>a>>b;
        if(a==1)
        {
            add(b);
        }
        else if(a==2)
            erasex(b);
        else
            out<<contains(b)<<endl;
    }
    return 0;
}