#include <bits/stdc++.h>

using namespace std;

ifstream fin("hashuri.in");
ofstream fout("hashuri.out");
int n, x, y;
set<int> s;

int main() {
    fin >> n;
    while(n--) {
        fin >> x >> y;
        
        if(x == 1) s.insert(y);
        else if(x == 2){
            if(s.count(y)) s.erase(y);
        }
        else {
            if(s.count(y)) fout << "1\n";
            else fout << "0\n";
        }
    }

    return 0;
}