#include <iostream>
#include <map>
#include <fstream>
using namespace std;
ifstream fin("hashuri.in");
ofstream fout("hashuri.out");
map <int,int> fr;
int n;
int main()
{
    fin>>n;
    for(int i=1;i<=n;i++)
    {
        int key,nr;
        fin>>key>>nr;
        if(key==1)fr[nr]=1;
        if(key==2)fr[nr]=0;
        else if(key==3)
        {
            if(fr[nr]==1)fout<<"1\n";
            else fout<<"0\n";
        }
    }
    return 0;
}