#include <fstream>
#include <tr1/unordered_map>
using namespace std;

ifstream f("hashuri.in");
ofstream g("hashuri.out");

tr1::unordered_map<int,int>lista;

int main()
{int t,op;
 long val;
 f>>t;
 while (t)
 {f>>op>>val;
  if (op==1)
  lista[val]=1;
  if (op==2)
  lista.erase(val);
  if (op==3)
  g<<lista[val]<<'\n';
  t--;
 }
    return 0;
}