//#include <iostream>
#include <bits/stdc++.h>
using namespace std;
ifstream in("hashuri.in");
ofstream out("hashuri.out");
unordered_map <int,bitset<1> >m;
int n;
int main()
{
    in>>n;
    for(int i=1;i<=n;i++)
    {
        int x,y; in>>x>>y;
        if(x==1)
            m[y]=1;
        else if(x==2)
            m.erase(y);
        else
        {
            if(m[y]==1)
                out<<1<<"\n";
            else
                out<<"0"<<"\n";
        }

    }
    return 0;
}