#include <fstream>
#include <unordered_map>
using namespace std;
unordered_map<int, int> mymap;
ifstream in ("elmaj.in");
ofstream out ("elmaj.out");
int n;
int main()
{
    in>>n;
    for (int i=1;i<=n;++i)
    {
        int op,nr;
        in>>op>>nr;
        if (op==1)
            {
                mymap[nr]=1;
                continue;
            }
        if (op==2)
            {
                mymap[nr]=0;
                continue;
            }
        if (op==3 && mymap[nr]==1)
            out<<'1'<<'\n';
        else
            out<<'0'<<'\n';
    }
    return 0;
}