#include <iostream>
#include <map>
#include <fstream>
using namespace std;
ifstream f("hashuri.in");
ofstream g("hashuri.out");
map <int,int> clau;
int i,n,nr,c;
int main()
{
    f>>n;
    for(i=1;i<=n;i++)
    {
        f>>c>>nr;
        if(c==1)
         ///   if(clau.count(nr)==0)
            clau[nr]=1;
        else
            if(c==2)
            ///if(clau.count(nr)!=0)
                clau[nr]=0;
            else
            {
                if(clau[nr])
                    g<<1<<"\n";
                else
                    g<<0<<"\n";
            }
    }
    return 0;
}