#include <iostream>
#include <fstream>
#include <vector>
#include <map>
#define mod 13831
using namespace std;
ifstream f("hashuri.in");
ofstream g("hashuri.out");
vector <int> v[mod];
 int n;
 map <int,int> m;

int main()
{ int i,t,x;
   f>>n;
   for(i=1;i<=n;i++)
   { f>>t>>x;
      if (t==1) { if (m.find(x)==m.end()) m[x]=1; }
      if (t==2) m.erase(x);
      if (t==3) { if (m.find(x)!=m.end()) g<<"1\n"; else g<<"0\n"; }
   }
    return 0;
}