#include <fstream>
#include <set>
using namespace std;
ifstream f("hashuri.in");
ofstream g("hashuri.out");
int n,i,tip,x,m;
set <int> a[666013];
set <int>::iterator cauta;
#define mod 666013;
int main()
{
    f>>n;
    for(i=1;i<=n;i++)
    {
        f>>tip>>x;
        m=x%mod;
        cauta=a[m].find(x);
        if(tip==1&&cauta==a[m].end())
            a[m].insert(x);
        else if(tip==2&&cauta!=a[m].end())
            a[m].erase(x);
        else if(tip==3) g<<(cauta!=a[m].end())<<endl;
    }
    return 0;
}