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