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