#include <bits/stdc++.h>

using namespace std;

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

map <int,int> v;
int n,nr;

int main(){
    int i, type, x;
    f >> n;
    while(n--){
        f >> type >> x;
        if(type == 1){
            if(v.find(x) == v.end())
                v[x] = ++nr;
        }else
            if(type == 2)
                v.erase(x);
            else
                g << (v.find(x) != v.end()) << "\n";
    }

    return 0;
}