#include <fstream>
#include <map>

using namespace std;

ifstream cin("hashuri.in");
ofstream cout("hashuri.out");

map<int,int>m;

int n,i,a,b;

int main()
{
    cin>>n;
    for(i=1;i<=n;++i)
    {
        cin>>a>>b;

        if(a==1) m[b]=1;
        if(a==2)
        {
            m.erase (b);
        }
        if(a==3)
        {
            map<int,int>::iterator it;
            it=m.find(b);
            if (it != m.end()) cout<<"1\n";
            else cout<<"0\n";
            //cout<<m[b]<<"\n";
        }

    }

    return 0;
}