#include <iostream>
#include <fstream>
#define MAX 1000000

using namespace std;

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

int N,v[MAX];

int main()
{int op,x;
f>>N;
while(N!=0)
{
    N--;
    f>>op>>x;
   {
    if(op==1)
      if(v[x]==0)
      v[x]=1;
    if(op==2)
       if(v[x]==1)
       v[x]=0;
    if(op==3)
       if(v[x]==1)
       g<<1<<endl;
       else
       g<<0<<endl;
   }
}
    cout << "Hello world!" << endl;
    return 0;
}