#include <bits/stdc++.h>
using namespace std;

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

map<int,bool>h;

int main()
{
    int n; in>>n;

    for(int i=1;i<=n;i++)
    {
        int op,x; in>>op>>x;

        if(op == 1 && h.find(x) == h.end()) h[x]=1;
        if(op == 2 && h.find(x) != h.end()) h.erase(x);
        if(op == 3 ) out<<bool(h.find(x) != h.end())<<'\n';
    }
    return 0;
}