#include <fstream>
#include <unordered_map>
#define Nmax 1000005
using namespace std;
ifstream fin("hashuri.in");
ofstream fout("hashuri.out");
unordered_map <int,int> m;
int n;
int main()
{
    int i,p,a;
    fin>>n;
    for (i=1;i<=n;i++)
    {
        fin>>p>>a;
        if (p==1)
            m[a]=1;
        if (p==2)
            m.erase(a);
        if (p==3)
            if (m.find(a)!=m.end())
                fout<<1<<"\n";
            else
                fout<<0<<"\n";
    }
    return 0;
}