#include <iostream>
#include <fstream>
#include <set>
using namespace std;
ifstream f("hashuri.in");
ofstream g("hashuri.out");
int main() {
    int n,op,x,i;
    f>>n;
    set<int> v;
    for(i=1;i<=n;i++)
    {
        f>>op>>x;
        if(op==1)
            if (v.count(x)==0)
                v.insert(x);
        if(op==2)
            if (v.count(x)>0)
                v.erase(x);
        if(op==3)
        {
            if (v.count(x)>0)
                g<<1<<endl;
            else g<<0<<endl;
        }
    }
    return 0;
}